Which of the following statements belong/s to the area of descriptive statistics? a. An economist forecasts the gross national product next year to be 6.5%. b. A statistics teacher shows a bar graph showing the number of enrollees per course. c. both a and b d. neither

Q: Why would you use a low alpha?

A: here use basic of hypothesis testing and type 1 and type 2 error

Q: 1. For the sample data Scatter Plot 10 9 8 7 4. 3 1 1 5 7 8. 1 3 5 8 y 2 4 6 a. Based on the scatter…

A: a. Scatterplot is a graphical representation between two variables, where each of the points of the…

Q: The calculated average for the validation sample is compared to the known value to determine the…

A: Solution: From the given information, the known value of NX is 4.60 mg/L and the average of NX is…

Q: a) Find the probability that the first lefty is the fourth person chosen.

A: here given p = probability of person is lefty  =0.09 n =4

Q: A researcher has a limited amount of time and money, so they want to choose the research design that…

A: Correct option is (A) The related samples t-test  It is also known as Dependent t test and paired t…

Q: Calculate the z test statistic and p-value for the above hypothesis test Pvakue

A: Given that  Sample Mean 1 (\bar X_1)(Xˉ1​) = 2626 Population Standard Deviation…

Q: Suppose that the number of Facebook friends users have is normally distributed with a mean of 135…

A: Introduction: Define X as the random variable of interest here, denoting the number of friends that…

Q: E(E E(Ytj – Ý;,)?) = (nr – r)o² 2 (nT – r)o?

A:

Q: cts that a lower percentage of those who live in the inner city have sleep apnea. Of the 303 people…

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Q: Suppose the following are the seasonal indices for the first three quarters of the year for a…

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Q: P(A° or B) = a. %3D b. P (A° or B) = %3D c. P(A°|B*) = Round to 3 decimal places

A: As per our company guidelines we are supposed to answer only first 3 sub-parts. Kindly repost other…

Q: QUESTION 16 The price of Apple iPad 2022 is recorded at a random sample of 64 electronics stores in…

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Q: You work for a soft-drink company in the quality control division. You are interested in the…

A: Given Information: Sample size n=16 Sample variance s2=0.012

Q: 3876741091676 quany? Jump to level 1 In a poll of 1000 randomly selected voters ina local election,…

A: We have given that  Sample size, n = 1000 Favourable cases, X = 272 Sample proportion, p^ = X/n The…

Q: A company is doing a hypothesis test on the variation of quality from two suppliers. They believe…

A: Given Level of significance ɑ=0.01, n1=40, n2=28 s1=2.92, s2=4.26  Hypothesis Ho: σ12=σ22 Vs H1: σ12…

Q: The patient recovery time from a particular surgical procedure is normally distributed with a mean…

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Q: What's the probability that bad credit customer does not receive a loan (sensitivity ot power of a…

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Q: Question 1 United Bank is studying the number of times the ATM, located in a shopping mall is used…

A: Given data is…

Q: In a certain computer card game, the player is awarded 5 points for each card that is moved to a…

A: Consider three random variables X1, X2, where, X1 have mean µ1 and variance σ12, X2 have mean µ2 and…

Q: (2) Here are grades collected from freshmen and sophomores Grade A F total Freshmen F 10 16 20 14 11…

A: As per our company guidelines we are supposed to answer only first 3 sub-parts. Kindly repost other…

Q: You measure 37 dogs' weights, and find they have a mean weight of 70 ounces. Assume the population…

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Q: You are interested in estimating the the mean age of the citizens living in your community. In order…

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Q: Solve the forwards problem below. Round all Z-scores to the nearest hundredth when necessary. Lena…

A: The mean is 20.7 and the standard deviation is 1.95.

Q: 2. In building an arena, steel bars with a mean ultimate tensile strength of 400 Megapascal (MPa)…

A:

Q: Suppose you had obtained a test statistic of 2.45 (this is incorrect). What would the P-value be?…

A: It is known that the test statistic = 2.45 Alpha = 0.01 Using Excel function, P-value = 0.0143.

Q: Random samples of 210 are taken from a population where p = 181. 39 25% of all sample means were…

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Q: A researcher obtains M = 45 with SS = 250 for a sample of n = 10 women and M = 49 with SS = 270 for…

A:

Q: Then this test is a one-tailed test O three-tailed test O two-tailed test zero-tailed test

A: We have given that  Population mean = 84 Sample mean = 87 Sample size = 25

Q: The symbol represents the mean of the sample. True O False Question Help: B Written Example Message…

A: Answer : True Notation for sample mean is x̄

Q: (c) In a random sample of visitors to a famous touris American tourists and 312 of 500 foreign…

A: X1 = 252, n1 = 750 And  X2  = 312, n2 = 500 Then,  We will find the 96% confidence interval for the…

Q: We want to conduct a hypothesis test of the claim that the population mean time it takes drivers to…

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Q: () = ("; ')-(,",) Q1. Show that : %D

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Q: Determine the margin of error for a confidence interval to estimate the population proportion for…

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Q: An automobile club reported that the average price of regular gasoline in a certain state was $2.63…

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Q: 6. Each year, a baseball team sells boxes of chocolates as a fundraiser to lower the cost of team…

A:

Q: (a) Show that e-x² dx = JT, and deduce that 1 exp { (x - )2 202 f(x) = -00 0. Provide a detailed…

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Q: Families who have pets are classified as having one, two or three pets. Let say that in a given…

A: There are some given information in the above question, the solution is givem below.

Q: ssume X ∼ Poisson(r), where r > 0. Prove that E(X) = r.

A: We have given that  X ~ Poisson(r), where r > 0.

Q: The following results are from data concerning the amount withdrawn from an ATM machine based on the…

A: It is given that the number of seconds spent at the ATM machine is 20.

Q: Determine the margin of error for a confidence interval to estimate the population proportion for…

A:

Q: 4) Upper confidence limit 0.820 %3D Lower confidence limit 0.490 %3D

A: here given , lower confidence limit  = 0.490 upper confidence limit  = 0.820

Q: a. Find the cubic function that is the best fit for the data in the table below. b. Find the quartic…

A: a Cubic function: Excel Procedure: Enter X, X^2, X^3 and Y data in Excel Go to Data Click on Data…

Q: 2 The mean age of 20 youth volunteers in a community project is 17.5 years with a st deviation of 2…

A: Given that  The mean age of 20 youth volunteers in a community project is 17.5 years with standard…

Q: 22. Researchers investigated whether a new process for producing yarn could reduce the mean amount…

A: Introduction: We need to identify the statement that is the best interpretation of the p-value.

Q: Monica, a chef at a 5-star restaurant makes eight different desserts. She wants to see if the…

A: The categorical variable is dessert. It has 8 categories. We have to find the critical value. This…

Q: 1. Previous evidence show that majority of the students are happy and contented with the…

A: The evidences show that majority of the students are happy and contented with the university's…

Q: B. Find the length of the confidence interval given the following data: 1. o = 0.3, n = 45,…

A: We have given that  Population standard deviation, σ = 0.5 Sample size, n = 50 Confidence level =…

Q: A sociologist is looking at the relationship between consumption expenditures of families in the…

A: a) Enter the data into the excel sheet as follows: Click on data > data analysis>…

Q: Who determines the probability with impressive accuracy, that the binomial distribution converged to…

A: In year 1733, De Moivre invented a formula to approximate binomial sums or probabilities when the…

Q: A graduate student conducted an experiment in which 15 ten-month-old babies were asked to watch a…

A: We have given that n = 15 x = 13 p̂ = x/n = 0.8667