To identify the correct Z(critical), it is important to determine whether the hypothesis test is one-tailed or two-tailed. The decision between a one- and two-tailed hypothesis is based on the researcher's expectations about the population from which the sample was selected.
Many people believe that millennials are having more sex than people during the sexual revolution. You wonder whether the cohort currently in their mid-20s have had more sexual partners than older generations. Assume that the the average number of sexual partners by age 25 is 4.2 partners. You obtain a sample that yields a sample mean of X‾‾ X ‾ = 6.5 partners.
Let μ denote the average number of sexual partners by age 25. Formulate your null and research hypotheses by selecting the appropriate values in the dropdown menus that follow.
H0 H 0 : (H1 H 1 : ) The test you conduct is________ test.
Note: A one-tailed test is described as a lower-tailed test if the null hypothesis is rejected for values of the test statistic in the lower tail of its distribution, and it is described as an upper-tailed test if the null hypothesis is rejected for values of the test statistic in the upper tail of its distribution. Use the distribution tables to complete the exercises that follow.
Sample mean, x̅ = 6.5
Null and Alternative hypothesis:
Ho : µ = 4.2
H1 : µ > 4.2
The test you conduct is upper-tailed test.
To identify the correct Z(critical), it is important to determine whether the hypothesis test is one-tailed...
Read the z statistic from the normal distribution table and circle the correct answer. A one-tailed test (upper tail) at a 123 level of significance, a. 1.645 b. 1.54 C. 1.96 O d. 1.16 When the hypotheses Ho μ z 100 and Ha μ < 100 are being tested at a level of significance of o, the null hypothesis will be rejected if the test statistic z is a. -za O c. 100 For a one-tailed test (upper tail) with...
For a one-tailed hypothesis test (upper tail) the p-value is computed to be 0.034. If the test is being conducted at 95% confidence, the null hypothesis Select one: a. is rejected. b. is not rejected. c. could be rejected or not rejected depending on the value of the mean of the sample. d. could be rejected or not rejected depending on the sample size.
A one-tailed test is a a. hypothesis test in which rejection region is only in the upper tail of the sampling distribution b. hypothesis test in which rejection region is in both tails of the sampling distribution c. hypothesis test in which rejection region is only in the lower tail of the sampling distribution d. hypothesis test in which rejection region is in one tail of the sampling distribution
You conduct a hypothesis test about a population proportion p at a significance level of a = .01 using a random sample of size n = 38. Your test statistic follows a standard normal distribution when the null hypothesis is true as an equality, and its value obtained from the sample is z = -2.75. Use the Distributions tool to help you answer the questions that follow. Select a Distribution Distributions 0 1 2 3 If you perform a lower...
A. Critical Values for Hypothesis Tests (o known) a) For an upper tailed hypothesis test when a = .0197, then 2 = b) For a two-tailed hypothesis test when a = 0.0104, then 2a/2= c) For a lower-tailed hypothesis test when a = 0.0132, then-Za = B. Critical Values for Hypothesis Tests (o unknown) a) For an upper tailed hypothesis test at 27 d.f. and a = .025, then ta = b) For a two-tailed hypothesis test at 58 d.f....
Write the null and alternative hypotheses. Determine whether the hypothesis test is left -tailed, right-tailed, or two-tailed and the parameter that is being tested. The mean age of lawyers in New York is believed to be 53.4 years. A researcher thinks the average is different now. a. Null Hypothesis: b. Alternative Hypothesis: c. Parameter: d. Type of test:
Determine a left-tailed, right-tailed, or two-tailed test from a given null and alternative hypothesis. David hypothesize that the average age of the population of Wyoming is less than 45 years. David records a sample mean equal to 42 and states the hypothesis as = 45 vs < 45. Select the best description for this type of test. a.) Two-tailed test b.) Left-tailed test c.) Upper-tailed test d.) Right-tailed test
In a one-tailed hypothesis test (upper tail), the test statistic is determined to be 2.5. the p-value for this test is a. .0228 b. .0062 c. .0056 d. .5228
5.in a lower one-tailed hypothesis test, chosen level of significance = 0.10, sample size = 55, and t-test statistic = -1.76. Which of the following is the conclusion? A) This is a high probability and the conclusion is difficult. B) The null hypothesis is rejected. C) There are many sampling errors. D) The null hypothesis cannot be rejected. 4. While checking for linearity by examining the residual plot, the residuals must: A) exhibit a linear trend. B) form a parabolic...
5. A null and alternative hypothesis are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed. HO: u>= 21 Ha: u<21