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Question 9 14 Marks) A college professor claims that the average cost of a paperback textbook...
Show all work by hand. A statistics professor at an all-women's college determined that the standard deviation of women's heights is 2.5 inches. The professor claims that men's heights ar...
Show all work by hand.
A statistics professor at an all-women's college determined that the standard deviation of women's heights is 2.5 inches. The professor claims that men's heights are more variable than women's heights. To test the claim, he randomly selected 41 male students from a nearby all-male college and found the standard deviation to be 2.9 inches. Use this sample data and a significance level of a 0.01 to test the professor's claim that the standard deviation of...
A publishing company claims that in fall 2019, the average price of college textbooks for a...
A publishing company claims that in fall 2019, the average price of college textbooks for a single semester is $385. Suppose you decide to collect data from a random sample of students to assess whether the publisher's claim is reasonable, and you find that in a random sample of 22 college students, the mean price of textbooks for the fall 2019 semester was $433.50 with a standard deviation of $86.92. At the 0.01 significance level, is there sufficient evidence to...
A publishing company claims that in fall 2019, the average price of college textbooks for a...
A publishing company claims that in fall 2019, the average price of college textbooks for a single semester is $385. Suppose you decide to collect data from a random sample of students to assess whether the publisher's claim is reasonable, and you find that in a random sample of 22 college students, the mean price of textbooks for the fall 2019 semester was $433.50 with a standard deviation of $86.92. At the 0.01 significance level, is there sufficient evidence to...
5. The reported average cost per workbook at a large college is $27.50. A professor claims that the actual...
5. The reported average cost per workbook at a large college is $27.50. A professor claims that the actual average cost per workbook is higher than $27.50. A sample of 40 different workbooks has an average cost of $29.95. The population standard deviation is known to be $5.50. Can the null hypothesis be rejected at alpha = 0.05? For question #5 (multiple choice), tell whether this a right, left, or two- tailed test. For question #6, identify the null hypothesis from choices given....
A publishing company claims that in fall 2019, the average price of college textbooks for a...
A publishing company claims that in fall 2019, the average price of college textbooks for a single semester is $385. Suppose you decide to collect data from a random sample of students to assess whether the publisher's claim is reasonable, and you find that in a random sample of 22 college students, the mean price of textbooks for the fall 2019 semester was $433.50 with a standard deviation of $86.92. At the 0.01 significance level, is there sufficient evidence to...
A publishing company claims that in fall 2019, the average price of college textbooks for a...
A publishing company claims that in fall 2019, the average price of college textbooks for a single semester is $385. Suppose you decide to collect data from a random sample of students to assess whether the publisher's claim is reasonable, and you find that in a random sample of 22 college students, the mean price of textbooks for the fall 2019 semester was $433.50 with a standard deviation of $86.92. At the 0.01 significance level, is there sufficient evidence to...
1. A well know Statistical Institution claims that the average College tuition for a law degree...
1. A well know Statistical Institution claims that the average College tuition for a law degree costs at least thirty five thousand dollars. Analyzing a sample of fifty law schools in the vicinity of the study we found the sample had a mean tuition of $33,450 with a population standard deviation of $5,978 per year. At 2% level of significance test the Institution's claim. (a) The hypothesis structure, (b) The p-value and if you accept or reject the claim (Round...
Conduct a hypothesis test for each problem, using the traditional method. Show the 5 steps and al...
Conduct a hypothesis test for each problem, using the traditional method. Show the 5 steps and all work for each hypothesis test. Be sure you select the correct test to use for each problem. 1. A telephone company claims that less than 30% of all college students have a limited number of text messages per month. A random sample of 150 students revealed that 41 of them have a limited number. Test the company's claim at the 0.01 level of...
It is stated that the average costof books and supplies for a college student is $402...
It is stated that the average costof books and supplies for a college student is $402 with a population standard deviation of $138. You would like to test this claim at the level of significance of .05. Using a simple random sample of 50 college students an average of $451 was computed. State the null hypothesis State the alternative hypothesis Calculate the test statistic Calculate the p-value What conclusion will you draw? Repeat the hypothesis test using the critical value approach? What...
A company claims that their lightbulbs last an average of 400 days. To test this claim,...
A company claims that their lightbulbs last an average of 400 days. To test this claim, a random sample of 25 lightbulbs is tested and it is observed that they last for an average of 380 days with a standard deviation of 60 days. Part A) Assuming that the population of the time to failure of all lightbulbs is normally distributed, test the null hypothesis that the average life-length of their lightbulb is 400 days against the alternative that it...
Show all work by hand.
A statistics professor at an all-women's college determined that the standard deviation of women's heights is 2.5 inches. The professor claims that men's heights are more variable than women's heights. To test the claim, he randomly selected 41 male students from a nearby all-male college and found the standard deviation to be 2.9 inches. Use this sample data and a significance level of a 0.01 to test the professor's claim that the standard deviation of...
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