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Q: 4.46 For a random sample of 36 graduate students in economics in a graduate economics program with…
A: Given Let n be the sample size X be the number of graduate mahor in mathematics n=36, x=8
Q: In each of the following scenarios there is something wrong. Describe what is wrong and give a…
A: Given that If you multiply a random vriable by 10
Q: You are playing a card came, and the probability that you will win a game is p = 0.88. If you play…
A: Given n=601, p=0.88
Q: A leading company established in Jamaica is planning to extend its marketing region to include the…
A: j) Null Hypothesis: H0: The constructed regression model is not good fit for predicting sales.…
Q: Suppose you have joint random variables X and Y. It is found that COV(X,Y)= -0.9, Var(X) = 4 , and…
A: Solution-: Given: Cov(X,Y)=-0.9, Var(X)=4, Var(Y)=2 We want to find correlation coefficient =?
Q: Find the area of the shaded region. The graph depicts the standard normal distribution of bone…
A: Given graph is
Q: 4. Find P7 A. z = -3.21 B. z = -1.48 C. z = 1.48 D. z = 0.74
A: Z-score percentile * For normal distribution Excel command to get z-score from p-value…
Q: Consider the density function: ) = {k√x₁ 0, f(x) = (a) Evaluate k (b) Find F (x) and use it to…
A: Given f(x)=k√x 0<x<1 Determine k and also cdf F(X)
Q: 68% of U.S. adults have very little confidence in newspapers. You randomly select 10 U.S. adults.…
A: Given that Number of trials n=10 Probability of success p=0.68 X~bin(n,p)
Q: Q. 2. Suppose Country B's government now reports that its population mean disposable household…
A:
Q: A field has 45% of pumpkin. How many degrees would that represent on a pie chart
A: Pie chart : It is circular graphical representation, One circle=360 degrees
Q: *Use the appropriate z-score formula for each of the following problems. Show this work only. Then…
A: GIVEN DATA normal distributionμ = 79.3σ = 7.9
Q: Subject: Statistics Question: The following data shows the number of Dengue cases in a Private…
A: Given data: 11, 18, 9, 10, 14, 15, 7, 18, 15, 10, 22, 19, 10, 16, 5, 7, 20
Q: 3. Each week a garment factory makes one production run of their popular tie-dyed cheesecloth…
A: Given information- We have given the probability distribution for X. X 5000 6000 8000 10000…
Q: 4.34 What is the shape of the theoretical sampling distribution of the mean for samples of (a) 10 if…
A: (a) we have given that, The parent population is normal. The sample size (n)= 10 Since,The parent…
Q: As part of a study on how people of different ages use mobile technology, each person in a sample…
A: Given Information: Age 20 to 39: Sample size n1=258 Number of successes x1=168 Age 40 to 49: Sample…
Q: X is a random variable with mean 30 and standard deviation 4. Y is a random variable with mean 50…
A: Given that. For X E(X) = 30 , Sd(X) = 4 , E(Y) = 50 , Sd(Y) = 8
Q: test for a new exam was given to randomly selected seniors. The exams were graded, and the sample…
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Q: The relationship between sales and advertising expenditures (both estimated in millions of dollars)…
A: Comment: As per the our company guidelines we are supposed to answer only three subparts. Kindly…
Q: Using the data given below, determine whether it would unusual for a household to have no HD…
A: Given that probability of having No HD television in a small town is 0.020
Q: USA Today reported results from an Arity survey in which 2018 drivers were asked if they text while…
A: 1. The survey conducted on 2018 drivers.
Q: Confidence level=95%, degrees of freedom=14 i
A: Ans# - Given confidence level = 95% degree of freedom = 14 Find t percentile that is…
Q: A manufacturer of phone batteries determines that the average length of talk time for one of its…
A: Mean=470, standard deviations σ=32
Q: 4. Find P7 A. Z = -3.21 B. z = -1.48 C. z = 1.48 D. z = 0.74
A: we had given data standard normal distribution z~N(0,1) we have to fond 7h percentile
Q: Complete the class frequency table below. Class interval 6-10 11-15 16-20 21-25 26-30 Total Class…
A: The data are arrange in increase order and the increase order are: 6, 7, 8, 10, 10, 11, 11, 11, 11,…
Q: A graduating class reported starting salaries represented on the following frequency table.…
A: According to the given information in this question We need to find mean of the given data
Q: K Assume that population proportion is to be estimated from the sample described. Use the sample…
A: Given that n = 535 , p^ = 0.4 95% confidence interval
Q: Suppose you roll two fair, six-sided dice - one red and one green. The following figure shows the…
A: It is given that two fair six-sided dice are rolled in which one red and one green.
Q: An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots…
A: The mean is 136 lb and a standard deviation is 26.8 lb.
Q: Exhibit 13-12 SSTR = 736 SSE = 900 nT= 18 Refer to Exhibit 13-12. The null hypothesis is to be…
A: Given that There are 3 treatments dfTreatments = 3 - 1 = 2 nT = 18 dfT = 18 - 1 = 17 dfError =…
Q: Given the raw data, create a box plot that would show central tendency and variability of data in…
A: Boxplot is basically a visual representation of 5 number summary which are : minimum, first…
Q: Happy Cruise lines provides vacations for customers to various Caribbean destinations .The mean…
A:
Q: For this question, use the file titled Practice_data_2.csv in D2L. The file comprises of the age,…
A: Loading the data in R:
Q: Assume that a randomly selected subject is given a bone density test. Bone density test scores are…
A: Given that Mean = 0 , Standard deviation = 1
Q: researcher performs atomic absorption measurements of 5 standard solutions on. A reference material…
A:
Q: Suppose you have two random variables, X and Y, where = 4, 5, 6, 7, 8 and y = 3, 4, 5. Let f(x, y) =…
A: Given Information: There are two random variables X and Y. where, x=4,5,6,7,8 and y=3,4,5.…
Q: (a) How large must n be if the length of the 95% CI is to be not greater than 40? (b) How large must…
A: It is given that the random variable gain is normally distributed with standard deviation σ = 20.
Q: When using the Central Limit Theorem, what is the "magic number" for sample size that allows you to…
A: the "magic number" for sample size that allows you to use the C.L.T even if the population is not…
Q: The bore size on a component to be used in assembly is a critical dimension. Samples of size 4 are…
A:
Q: mean of the set of numbers is 17. Find the value x, if sample values are: 12, 18, x, 21, 13
A: Given that Mean = 17 The data are 12, 18, x, 21, 13
Q: A college claims that the proportion, p, of students who commute more than fifteen miles to school…
A: GIVEN DATA,claim :p <0.25n=260x=62p^=xn=62260=0.2385one -tailed test
Q: D. Decide whether the variables represented by the scatter plots below are positively or negatively…
A: Decide whether the variables represented by the scatter plot are positively or negatively correlated
Q: The length of human pregnancies from conception to birth approxi- mates a normal distribution with a…
A: given data normal distribution μ = 266 daysσ = 16 dayswhich interval will contain 68%…
Q: The cumulative frequency function of a discrete variable X in group A is given by x < 12 12 < x < 32…
A:
Q: The efficiency for a steel specimen immersed in a phosphating tank is the weight of the phosphate…
A: a) we need to find regression equation for the given data. Given X is the Temperature and Y-…
Q: The manager of a bookstore with a coffee shop wants to know the proportion of customers that come…
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Q: Let z be a standard normal random variable with mean μ = 0 and standard deviation = 1. Use Table 3…
A: given data standard normal distribution μ = 0σ = 1Z~N(0,1) (A) P(-1<Z<1) = ? (B)…
Q: Consider the apportionment of 27 projectors for a school district with four campus locations labeled…
A:
Q: Suppose that X is a random variable with mean 30 and standard deviantion 4. Suppose Y is a random…
A: Given that For X E(X) = 30 , Sd(X) = 4 For Y E(Y) = 50 , Sd(Y) = 8 Corr(X,Y) = 0.50
Q: 4.52 On a particular test for a very large statistics class, a random sample of n = 4 students has a…
A: Given that Sample size n =4 Sample mean=75 Sample standard deviation =8
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- QUESTION 12 Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous 6 months, in a sample of 115 new-car buyers, 46 have traded in their old car. To determine (at the 10% level of significance) whether the proportion of new-car buyers that trade in their old car has statistically significantly decreased, what can you conclude concerning the null hypothesis? Reject the null hypothesis Fail to reject the null hypothesisQuestion #4. US Universities found that 72% of people are concerned about the possibility that their personal records could be stolen over the Internet. If a random sample of 300 college students at a Midwestern university were taken and 228 of them were concerned about the possibility that their personal records could be stolen over the Internet, could you conclude at the 0.025 level of significance that a higher proportion of the university's college students are concerned about Internet theft than the public at large? Report the p-value for this test. Z0.025 = 1.96Question 02 There is a claim that drink driving has been very common in high ways. The Highway Police randomly caught 300 drivers for breath alcohol test and found that 14% of drivers have breath alcohol over the legal limit. At 4% level of significance, use the p-value approach to test the hypothesis that the percentage of drivers who are drink driving is more than 10%.
- QUESTION 12 Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous 6 months, in a sample of 115 new-car buyers, 46 have traded in their old car. To determine (at the 10% level of significance) whether the proportion of new-car buyers that trade in their old car has statistically significantly decreased, what can you conclude concerning the null hypothesis?QUESTION 19 To study whether the students at a university are more or less satisfied with the current food service compared to the previous food service, a sample of 90 current students is taken and finds that 37 are satisfied with the current food service. A similar survey was taken for the previous food service in which 89 students surveyed found that 40 were satisfied with the previous food service. When testing the hypothesis (at the 5% level of significance) a higher percentage of students were satisfied with the previous food service than with the current food service, what is the test statistic? (please round your answer to 2 decimal places)If the researcher has set the alpha for the test described in Question #6 and #7 at .05, they should: Group of answer choices abandon their research question reject the null hypothesis fail to reject the null hypothesis try again with a different alpha
- A report states the average temperature for the month of June on a specific tropical island is 98 degrees F. A meteorologist claims the report is not correct.. Data collected from 35 areas on the island showed an average temperature of 95 degrees F. Thepopulation standarddeviation is known to be 6.0 degrees F. At alpha = 0.01, can the report's average be rejected? For question #1, tell what type of test: right-tailed, left-tailed, or two-tailed. For question #2, identify the alternative hypothesis (H1) from choices given. For question #3 give just your calculated z-value that you are going to use to make a decision on the null hypothesis. For question #4, answer True or False as to whether the null hypothesis is rejected.QUESTION 5. (Data file included: Yes; In Sheet: Quality): Quality Associates, Inc., a consulting firm, advises its clients about sampling and statistical procedures that can be used to control their manufacturing processes. In one particular application, a client gave Quality Associates a sample of 800 observations taken while that client’s process was operating satisfactorily. The sample standard deviation for these data was 0.21; hence, with so much data, the population standard deviation was assumed to be 0.21. Quality Associates then suggested that random samples of size 30 be taken periodically to monitor the process on an ongoing basis. By analysing the new samples, the client could 5 quickly learn whether the process was operating satisfactorily. When the process was not operating satisfactorily, corrective action could be taken to eliminate the problem. The design specification indicated that the mean for the process should be 12. Corrective actions should be taken is the mean…QUESTION 5. (Data file included: Yes; In Sheet: Quality): Quality Associates, Inc., a consulting firm, advises its clients about sampling and statistical procedures that can be used to control their manufacturing processes. In one particular application, a client gave Quality Associates a sample of 800 observations taken while that client’s process was operating satisfactorily. The sample standard deviation for these data was 0.21; hence, with so much data, the population standard deviation was assumed to be 0.21. Quality Associates then suggested that random samples of size 30 be taken periodically to monitor the process on an ongoing basis. By analysing the new samples, the client could 5 quickly learn whether the process was operating satisfactorily. When the process was not operating satisfactorily, corrective action could be taken to eliminate the problem. The design specification indicated that the mean for the process should be 12. Corrective actions should be taken is the mean…
- Question 14 Exercise and the BrainIt is well established that exercise is beneficial for our bodies. Recent studies appear to indicate that exercise can also do wonders for our brains, or, at least, the brains of mice. In a randomized experiment, one group of mice was given access to a running wheel while a second group of mice was kept sedentary. According to an article describing the study, "The brains of mice and rats that were allowed to run on wheels pulsed with vigorous, newly born neurons, and those animals then breezed through mazes and other tests of rodent IQ"1 compared to the sedentary mice. Studies are examining the reasons for these beneficial effects of exercise on rodent (and perhaps human) intelligence. High levels of BMP (bone-morphogenetic protein) in the brain seem to make stem cells less active, which makes the brain slower and less nimble. Exercise seems to reduce the level of BMP in the brain. Additionally, exercise increases a brain protein called noggin, which…QUESTION 18 In 2003, Major League Baseball took steps to speed up the paly of baseball games in order to maintain fan interest. In a sample of 94 games in 2002, 37 finished in less than 3 hours. A similar survey in 2003 of 78 games found that 42 finished in less than 3 hours. When testing the hypothesis (at the 5% level of significance) a higher percentage of games finished in less than 3 hours in 2003, what is the test statistic? (please round your answer to 2 decimal places)QUESTION 3 Which of the following can cause OLS estimators to be biased? Explain each of the following points: Heteroscedasticity Omitting an important variable A sample correlation coefficient of 0.95 between two independent variables both included in the model.