The given information is available for two samples selected from independent normally distributed populations.Population A: n₁ = 28, s² = 168.4Population B: n₂ = 28, S² = 139.8How many degrees of freedom are there in the numerator and denominator of the F test?There areThere aredegrees of freedom in the numerator.degrees of freedom in the denominator.

Given that Sample size of A n1=28 Sample size of B n2=28

Answered: he given information is available for…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 95% confident that the sample percentage is within 4.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. n= (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 37% of air passengers prefer an aisle seat. n = (Round up to the nearest integer.)
If a sample has n=23 items, how many degrees of freedom should there be if you 're doing a t-test?
Q2: The median age of the children is: 29 30.5 28.5 28
a-d
Why must the sum of all fs in a sample equal N?
One thousand customers entering a mall, in a city, were randomly selected and asked to rank the variety of stores. The results are given in the following incomplete table. Response Excellent Very good Good Fair Poor Frequency 50 152 255 Answer: Relative frequency 0.4250 0.1180 What proportion of customers did not rank the store variety as very good or excellent? (Type your final answer in decimal form, like 0.25)
In a survey of 500 drivers from the South, 408 wear a seat belt. In a survey of 370 drivers from the Northeast, 288 wear a seat belt. At a = 0.07, can you support the claim that the proportion of drivers who wear seat belts is greater in the South than in the Northeast? Assume the random samples are independent. Complete parts (a) through (e). (a) Identify the claim and state Ho and Ha The claim is "the proportion of drivers who wear seat belts in the South is greater than in the Northeast." Let p, represent the population proportion for the South, and p2 represent the population proportion for the Northeast. State Hg and H Choose the correct answer below. O B. Ho: P1 = P2 OC. Ho: P, * P2 O A. Ho: P1 > P2 H: P, SP2 H: P, *P2 Ha: P1 = P2 O D. Ho: P1 P2 OF. Ho: P1 2 P2 H,: P, OC. z
A public opinion poll surveyed a simple random sample of voters. Respondents were classified by gender (female or male) and by voting preference (Republican, Democrat, or Independent). The results are presented here: Republican 261 202 Female Male You want to determine if gender and voting preference are independent. Use a level of significance of a = 0.05. What is the test statistic for this test? (Round your answer to three decimal places.) Democrat 239 181 Independent 42 62
Types of Error: E In a certain population, the mean mu is 45. There are one thousand statisticians, and none of them know what mu is. Each statistician takes a simple random sample from this population, and each one uses his/her sample to perform the following two-sided test: H0: mu = 42 Ha: mu != 42 The plan is to reject the Null Hypothesis if the P-value is less than 0.05. How many of the statisticians will commit a Type-I error? Group of answer choices ( ) About half of them ( ) None of them. ( ) All of them. ( ) About 50 of them ( ) About 100 of them.
Suppose the Humane Society claims that 30% of U.S. households own cats. You believe your community is different than the U.S. percentage. To test the claim, you take a simple random sample of 300 households and find that 37% own cats. Test at 5% significance. Round to the fourthH0H0:Select an answer x̄ p̂ μ p Correct Select an answer = < > ≠ Correct CorrectHAHA:Select an answer x̄ p̂ μ p Correct Select an answer = < > ≠ Correct CorrectWhat's the minimum population size required? IncorrectHow many successes were there? CorrectTest Statistic: CorrectP-value: CorrectDid something significant happen? Select an answer Significance Happened Nothing Significant Happened Correct Select the Decision Rule: Select an answer Reject the Null Accept the Null Fail to Reject the Null Correct There Select an answer is is not Correct enough evidence to conclude find the minimum population size required.
Participants who agree to use a certain weight loss pill to help alleviate their hunger were randomly surveyed before and after taking the weight loss pill. Their responses are given below using a scale from 1 to 10, where 1 is a small amount of hunger and 10 is very hungry. Does this weight loss pill help alleviate hunger? Before 9 9 7 6 8 7 7 5 8 After 8 9 6 5 8 7 8 4 6 What is the decision for this test? Participants who agree to use a certain weight loss pill to help alleviate their hunger were randomly surveyed before and after taking the weight loss pill. Their responses are given below using a scale from 1 to 10, where 1 is a small amount of hunger and 10 is very hungry. Does this weight loss pill help alleviate hunger? Before 9 9 7 6 8 7 7 5 8 After 8 9 6 5 8 7 8 4 6 What is the decision for this test? Fail to reject the null because the test statistic is not in the critical region and the p-value is less than alpha. Reject the null because the…
Determine the P-value for a two-sided test with t = 2.85 and n=9 O a. 0.015 O b. 0.01 OC. 0.035 O d. 0.0175

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