If the standard error of the mean for the sampling distribution of random samples of size 25 from a normal distribution is 2.0, how large must the size of the sample become if the standard error is to be reduced to 1.25? O 100 O 64 49 O 81

Q: Chi-Square Analysis A company records the number of absences of their employees to assess…

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Q: Researchers developed a "dog IQ test" and find that the population of dogs in the United States has…

A: We have given that mean score of µ = 20 standard deviation of σ = 2 sample of n = 40

Q: The average weekly incomes, in £s, of 18 selected occupations in the United Kingdom were: 244, 146,…

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Q: For each of the following research questions, state the null and research hypotheses in words and…

A: The objective is to state the null and alternate hypotheses and also state the type of hypothesis…

Q: Answer #14: (mode of given #3) Direction: Complete the table below by finding the mean, median and…

A: The question is about to find mode Given : # 3 ) Data : 31, 33, 39, 36, 33

Q: How many pupils from each year should be selected to give a stratified sample of 10%?

A: here use basic of stratified sampling method  sample size from each strata  = total sample sizetotal…

Q: Miller (2008) examined the energy drink consumption of college undergraduates and found that males…

A: Given  μ = 30 σ = 14 n=8 X-bar=16

Q: Chocolate-cream cheese Strawberry-white chocolate Coconut Coconut Coconut Chocolate-cream cheese…

A: Given a bar graph, we have to describe the distribution for the flavor of cupcake for the sample of…

Q: lease help! :< STATISTICS AND PROBABILITY (PLEASE SHOW your COMPLETE & CLEAR solutions) RATE WILL…

A: A sample of 150 households in the area; n=150 An investigator found that members of 60 households ;…

Q: A set of data with a mean of 45 and a standard deviation of 8.3 is n Find each value, given its…

A: A mean is 45 with standard deviation 8.3 normally distributed. μ=45σ=8.3

Q: i dont understand how you got the 0.58

A: The mean is 8 and the variance is 16.

Q: Refer to the accompanying data display that results from a sample of airport data speeds in Mbps.…

A: Given n=50

Q: contradict the hypothesis that 70% of the firms in general are planning to expand next year. Given…

A: HERE GIVEN , n = sample size = 70 x = number of business firm planning to expand their capacities…

Q: en the “significance level below”, state the confidence level. Sketch the Z-score graph with the…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: Given the “significance level below”, state the confidence level. Sketch the Z-score graph with…

A: Given data: Significance level (α) = 0.01  H0 =  µ   vs        H1 &lt; µ  Critical value (Zα) =…

Q: 2. A school keeps a record of drinks purchased from their cafeteria. The data in the table show the…

A: Since, we only do up to three subparts of a problem, we'll be doing the first three sub parts only.…

Q: what is the only plausible value of correlation r based on the following scatterplot 1 0.9 0.8 0.7

A: The scatterplot represents the relationship bet. variable X and variable Y.

Q: 5. A multiple choice test has 5 questions. For a subject making random guesses for each answer, the…

A: Solution-: We have following probability distribution table: X P(X) 0 0.4096 1 0.4096 2…

Q: The following is the age distribution of 1,000 persons working in a large industrial house:…

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Q: It was claimed that 90% of all dentists recommend Tentodyne toothpaste. A consumer group doubted…

A: Given information: Total no. of dentists(n)=400No. of dentists recommends Tentodyne toothpaste…

Q: 2. The storage length and storage relative humidity are A. both fixed B. both random factors,…

A: Fixed factors/variables: These factors are of fixed nature. It means that it does not change by the…

Q: Don has an assignment to ask at random 10 students in their school about their ages. The data are…

A: (2) The first , Second and Third Quartiles are 11.75, 13, 14.25. So the total number of Students…

Q: Is there evidence to support the claim of the manufacturer? [Select]

A: From the given information, the 95% confidence interval is (191.03, 200.97).

Q: a random sample of 1000 google play apps was collected and the average rating was calculated to be…

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Q: *Assume that the random variable X is normally distributed, with mean - 45 and standard deviation -…

A: A continuous random variable X is said to follow Normal distribution with parameters μ and σ2 if its…

Q: Using second order polynomial regression, find the "best fit." Show your complete solution. X f(x)…

A: Given the data as x fx 1 0 1.5 0.4054641 2.5 0.9162907 3 1.0986123 3.5 1.2527630 4…

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores…

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Q: Q1. A sample of size n = 8 drawn from a normally distributed population has sample mean =14.8 and…

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Q: 9. mean = 676; standard deviation = 60 Page

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Q: le and interpret

A: The P-value is the probability, computed considering the null hypothesis is true, by calculating the…

Q: Calculate the two-sided 99% confidence interval for the population mean (mu) given that a sample of…

A: It is given that  Sample mean = 14.63 Sample standard deviation = 2.41 Sample size = 18 Confidence…

Q: According to the LA Times, "In an annual survey of more than 500 beaches, Heal the Bay reported ...…

A: Since we only do up to three sub parts of a problem, we'll be doing the first three sub parts only.…

Q: Is that a big baby? The average birth weight in the US is µ ≈ 120 ounces (7 pounds, 8 ounces) with a…

A: According to the given information in this question We need to find the z score value

Q: 021. The confidence interval for the population mean is B) (24.42, 27.98) A) (26.08, 26.32) Q22. The…

A: Given that  Sample size n =32 Sample mean =26.2 Population standard deviation=5.15

Q: 5. How would you generate a random sample from the statistical distribution given in the following…

A: Given information: x P(x) 0 14 1 12 2 14 Sum 1

Q: Q1. A sample of size n = 8 drawn from a normally distributed population has sample mean =14.8 and…

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Q: A real estate agent compares the selling prices of homes in two municipalities in southwestern…

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Q: Based on the diagram below, create a flowchart when a z-test for a  proportion is appropriate or…

A: Z-test for a proportion: This test is applicable when population is normally distributed. It is used…

Q: many books would I need to select from each category for a 5% stratified sample? 5% of. ......…

A: Twelve boxes of books are delivered to a school. Altogether there are 400 books delivered. From…

Q: In a frequency table, the upper boundary of each class interval has a constant ratio to the lower…

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Q: In an experiment, 18 babies were asked to watch a climber attempt to ascend a hill. On two…

A: Given: n = 18 s = 1.86 Mean difference = 1.06

Q: In physiology, an objective measure of aerobic fitness is how efficiently absorb and use oxygen…

A: *Answer:  Shapiro-Wilk Normality Test   Male Female W 0.94898 0.96948 p-value 0.17212…

Q: D.Compute and interpret the sample correlation co efficient  e. Generate a line of best fit in…

A: Correlation is used to measure the strength of association between the two variable. It used…

Q: Q18. If n = 32,0 = 5.15, = 26.2,a= 0.05, In testing H,:u=25,H₁:25, the rejection region is A) Z>…

A: Given that  Sample size n =32 Sample mean =26.2 Population standard deviation =5.15 NOTE:- According…

Q: (b) The following table gives the results of 250 samples, all of same size, drawn from the same…

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Q: What is the Sample Skewness for the following numbers: mean of 101 , median of 99, and standard…

A: Skewness is used to measure the symmetry of the data set. If the skewness value is 0 then there…

Q: What is the Sample Skewness for the following numbers: mean of 101.67 , median of 95, and standard…

A: It is given that  Mean = 101.67 Median = 95 Standard deviation = 55.89

Q: A probability experiment is conducted in which the sample space of the experiment is S =…

A: It is given that  The sample space is S = {9,10,11,12,13,14,15,16,17,18,19,20} The event is E =…

Q: What is the average number of points you would expect to lose if you roll the die 60 times? b.…

A: Given : Number of times die is rolled =50 Lose a point if 1 is rolled

Q: A sample of non-English majors at a selected college was used in a study to see if the student…

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