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STATS 250 Midterm: 350 W09 Exam 2 Review Questions

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emeralddonkey197
30 Oct 2014
School
U of M
Department
Statistics
Course
STATS 250
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All

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STATS 250 Full Course Notes
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STATS 250 Full Course Notes
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Statistics 350 exam 2 review - winter 2009: the neo-pr personality inventory is a test designed to measure various aspects of adult personality, one such aspect is agreeableness. Suppose these psychology majors can be considered a random sample of all psychology majors. Show all work: an experiment is conducted to compare a new drug x to placebo. For the measured response, higher values imply a better response. The following hypotheses were to be tested at the 10% significance level: H0: the population mean response for drug x is equal to that of placebo ( 1 = 2) Comparing the two boxplots (one for each group) side-by-side shows similar ranges and iqrs. 0. 10: the test statistic for testing the above hypotheses is 2. 34 and the corresponding p-value is 0. 013. Since the p-value < 0. 10, we reject h0. The probability that the population mean response for drug x is equal to that of placebo is 0. 013.

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Related textbook solutions

Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

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Related Questions

Use the following scenario for questions 6 – 8. In 2016-17, the average SAT score of the UVA first year class was 1420 out of 1600. An advisor in the statistics department is interested in determining whether statistics majors from that class have higher SAT scores than the average. He tests H,:µ = 1420 against Hạ: µ > 1420, where u is the mean SAT score for statistics majors from the 2016-17 first year class. In a simple random sample of 30 statistics majors, he finds a sample mean SAT score of 1440 with sample standard deviation of 40.

6. What is the value of the test statistic for this significance test?

a. 0.09

b. 0.5

c. 2.73

d. 20

7. From what distribution is this test statistic?

a. N(0, 1)

b. N(1420, 7.30)

c. t distribution with 29 degrees of freedom

d. t distribution with 28 degrees of freedom

8.) The p-value for this test is 0.005. Which of the following is a proper interpretation of this p- value?

a.There is a 0.5% chance that the null hypothesis is true.

b. If the population mean SAT score really is 1420, there's a 0.5% chance that the sample a. mean SAT score from 30 statistics majors would equal 1440.

c.If the population mean SAT score really is 1420, there's a 0.5% chance that the sample mean SAT score from 30 statistics majors would be 1440 or lower.

d. If the population mean SAT score really is 1420, there's a 0.5% chance that the sample mean SAT score from 30 statistics majors would be 1440 or higher.