A data set includes data from student evaluations of courses. The summary statistics are n= 94, x= 4.11, s = 0.68. Use a 0.05 significance level to test the claim that the population of student course evaluations has a mean equal to 4.25. Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. Determine the test statistic. (Round to two decimal places as needed.) Determine the P-value. (Round to three decimal places as needed.)

An ANOVA is used to evaluate the mean differences among three treatment conditions with a sample of n = 12 participants in each treatment. For this study, what is dfrotal? 2 11 35 33

Suppose you are interested in testing whether the mean earnings of men in the General Social Survey is representative of the earnings of the entire U.S. male population. The average male in the General Social Survey earned 31,607ドル in 2005 and the average male in the population earned 33,405ドル in 2005. State the null and research hypotheses. (you can write out your hypotheses using words, rather than use symbols if that's easier)

(d) State the conclusion in context of the problem. There sufficient evidence at the a= 0.01 level of significance to conclude that the population mean is different from 24.

A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score, U , on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate U. What is the minimum sample size needed in order for you to be 90% confident that your estimate is within 5 of U? Use the value of 20 for the population standard deviation of scores on this subsection. Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (If necessary, consult a list of formulas.)

A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score, μ , on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate μ . What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 4 of μ ? Use the value 23 for the population standard deviation of scores on this subsection. Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).

A test (Test A) was developed as a possible replacement for an old stat test (Test B). An stat test claimed that mean time to finishe the new test A was more than the mean time to finish an old test B. The summary data for completion time (in minutes) are as follows. Test A : n=7, X bar=158 minutes, S2=165 minutes Test B : n=11 X bar=152 minutes, S2=33 minutes Estimate of standard error=16 P=value: Use t-distribution, tp-value is equal to 0.1307 for one tailed test. P-value 0.1307> significance level a=0.10, fail 2 reject. So there is not enough evidence to support the claim that mean time to complete the new test A is more than the meantime to complete old test B.

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A data set includes times (in minutes) of taxi cab rides in New York City yellow cabs during a Friday morning of the same day in a recent year. Using 33 of the times to test the claim that the mean of all such times is less than 15 minutes, the accompanying Minitab display is obtained. Test the given claim by using the display provided from Minitab. Use a 0.05 significance level. O Click the icon to view the Minitab display. Identily the null and alternative hypotheses. Họ: Hy: (Type integers or decimals. Do not round.)

Answer the following True or False: If the p-value is 0.13 and the level of significance , a , is 0.05 in a hypothesis test for a mean, then we accept the null hypothesis. true false

2.103 Exercise and adequate sleep. A survey of 656 boys and girls, who were 13 to 18 years old, asked about adequate sleep and other health-related behaviors. The recommended amount of sleep is six to eight hours per night. 30 In the survey, 59% of the respondents reported that they got less than this amount of sleep on school nights. An exercise scale was developed and used to classify the students as above or below the median in this domain. Here is the 2 ×ばつ 2 table of counts with students classified as getting or not getting adequate sleep and by the exercise variable: Lil, SLEEPioos s diiw enoilatn.adtlo noowiod noisioozzs or ovenolw.ovitipog os Exercise Enough sleep High Low Yes 151 115 othe are No 148 242 habit and no noi

3.)

A data set includes times (in minutes) of taxi cab rides in New York City yellow cabs during a Friday morning of the same day in a recent year. Using 38 of the times to test the claim that the mean of all such times is less than 15 minutes, the accompanying Minitab display is obtained. Test the given claim by using the display provided from Minitab. Use a 0.05 significance level. Answer The Last Question in Picture: State the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim FILL IN THE BANKS