Suppose there is a claim that a certain population has a mean, \( \mu \), that is different than 8 . You want to test this claim. To do so, you collect a large random sample from the population and perform a hypothesis test at the 0.05 level of significance. To start this test, you write the null hypothesis, \( H_{0} \), and the alternative hypothesis, \( H_{1} \), as follows. \[ \begin{array}{l} H_{0}: \mu=8 \\ H_{1}: \mu \neq 8 \end{array} \] Suppose you also know the following information. The value of the test statistic based on the sample is -1.728 (rounded to 3 decimal places). The \( p \)-value is 0.084 (rounded to 3 decimal places). (a) Complete the steps below for this hypothesis test. Standard Normal Distribution Step 1: Select one-tailed or two-tailed. One-tailed Two-tailed Step 2: Enter the test statistic. (Round to 3 decimal places.) \( \square \) Step 3: Shade the area represented by the \( p \)-value. Step 4: Enter the p-value. (Round to 3 decimal places.) \( \square \) (b) Based on your answer to part (a), which statement below is true? Since the \( p \)-value is less than (or equal to) the level of significance, the null hypothesis is rejected. Since the \( p \)-value is less than (or equal to) the level of significance, the null hypothesis is not rejected. Since the \( p \)-value is greater than the level of significance, the null hypothesis is rejected. Since the \( p \)-value is greater than the level of significance, the null hypothesis is not rejected.
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Since the alternative hypothesis \( H_1 \) is \( \mu \neq 8 \), this suggests that the mean could be either less than or greater than 8. Therefore, we are dealing with a two-tailed test. Show more…
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Suppose there is a claim that a certain population has a mean, that is equal to. You want to test this claim. To do so, you collect a large random sample from the population and perform a hypothesis test at the 0.05 level of significance. To start this test, you write the null hypothesis Ho and the alternative hypothesis H, as follows: Ho: μ = 5 H1: μ ≠ 5 Suppose you also know the following information. The critical values are ±1.960 (rounded to 3 decimal places). The value of the test statistic is 2.574 (rounded to 3 decimal places). Complete the steps below to show the rejection region(s) and the value of the test statistic for this test. Normal Distribution Step 1: Select one-tailed (o-tailed): One-tailed Step 2: Enter the critical value(s). (Round to 3 decimal places) Step 3: Enter the test statistic (Round to 3 decimal places) Based on your answer to part (a), choose the correct statement. The value of the test statistic lies in the rejection region. The value of the test statistic doesn't lie in the rejection region. Based on your answer to part (b), which statement below is true at the 0.05 level of significance? The null hypothesis should be rejected. The null hypothesis should not be rejected.
David N.
Hoan N.
Consider the following hypothesis statement using α = 0.05 and data from two independent samples. Assume the population variances are not equal and the populations are normally distributed. Complete parts a and b. Ho: μ1 = 140.0, μ2 = 145.8 H1: μ1 < μ2 s1 = 11.2, s2 = 24.2 n1 = 35, n2 = 21 a. Calculate the appropriate test statistic and interpret the result. The test statistic is t = (x1 - x2) / sqrt((s1^2 / n1) + (s2^2 / n2)). (Round to two decimal places as needed.) The critical value(s) is(are) t = -tα,df (Round to two decimal places as needed. Use a comma to separate answers as needed.) Because the test statistic t is less than the critical value tα,df, we reject the null hypothesis. b. Identify the p-value from part a and interpret the result. The p-value is the probability of observing a test statistic as extreme as the one calculated, assuming the null hypothesis is true. (Round to three decimal places as needed.) Interpret the result. Choose the correct answer below. OA. Since the p-value is less than the significance level, reject the null hypothesis. OB. Since the p-value is less than the significance level, do not reject the null hypothesis. OC. Since the p-value is not less than the significance level, do not reject the null hypothesis. OD. Since the p-value is not less than the significance level, reject the null hypothesis.
Adi S.
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