Suppose that 5000 students who have taken the SATexam once are randomly assigned to either take an SATcoaching course or not, with the following results in theirimprovements in SAT scores when they take the exam asecond time:CoachingGroupControlGroupSampleSample Size Sample Mean StandardDeviation2500250046.244.412.35.5 Which decision should be made regarding the nullhypothesis based on the null hypothesis?Accept the null hypothesisTo little information to make a decision regarding the null hypothesisFail to reject the null hypothesisReject the null hypothesis

n1=n2=2500,X1¯=46.2,s1=12.3,X2¯=44.4,s2=5.5

Answered: Which decision should be made regarding…

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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Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The mean shopping time, µ, spent by customers at the supermarkets has been reported to be 40 minutes, but executives hire a statistical consultant and ask her to determine whether it can be concluded that u is less than 40 minutes. To perform her statistical test, the consultant collects a random sample of shopping times at the supermarkets. She computes the mean of these times to be 34 minutes and the standard deviation of the times to be 10 minutes. Based on this information, answer the questions below.
If the equality term in the null hypothesis involves or 2, then which test would be appropriate? * O z-value test O two-tail test O p-value test O one-tail test
a) In a chi-square test, the “expected” counts are the values we expect if there is an association between the variables. True False b) A small chi-square test statistic is consistent with the null hypothesis. True False
The assumption, "The children who attend academic after-school programs have higher grades than those children who do not attend after-school programs" is an example of a/n: Alternative Hypothesis (H₁) O Null Hypothesis (Ho) Ordinal statement O None of the given choices
3
A recent study at a university showed that the proportion of students who commute more than 15 miles to school is 25%. Suppose we have good reason to suspect that the proportion is greater than 25%, and we carry out a hypothesis test. State the null hypothesis H, and the alternative hypothesis H, that we would use for this test. Ho: 0 H;: D O
What is also the rejection criteria?
I need help on my classwork
28 a-true b-false
what is the correct choice
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Which decision should be made regarding the null ypothesis based on the null hypothesis? O Accept the null hypothesis O To little information to make a decision regarding the null hypothesis O Fail to reject the null hypothesis O Reject the null hypothesis