More on finding significant z-scores. Consider a one-sided significance test for a population mean, where the alternative is “greater than.”
(a) Sketch a Normal curve similar to that shown in Figure 6.10, but find the value z such that P = 0.05.
(b) Based on your curve from part (a), what values of the z statistic are statistically significant at the α = 0.05 level?
More on finding significant z-scores. Consider a one-sided significance test for a population mean, where the...
A test statistic for a two sided significance test for a population mean is z=2.31. Sketch a standard Normal curve and mark this value of z on it. Find the P-value and shade the appropriate areas under the curve to illustrate your calculations.
Consider a significance test for a null hypothesis versus a two-sided alternative. State all values of a standard normal test statistic z that will give a result significant at the 10% level but not at the 5% level of significance.
The z statistic for a one-sided test is z = 2.433 for an alternative Ha: μ > μa. This test is: a. unable to determine b. significant at α = 0.05 but not α = 0.01 c. not significant at both α = 0.05 and α = 0.01 d. significant at both α = 0.05 and α = 0.01
A one-sample z-test for a population mean is performed. Suppose that the P-value for the test is 0.04. For what significance levels (values of α) can the null hypothesis be rejected? For α = 0.05, 0.10 For α = 0.04 For all values of α smaller than 0.04 For all values of α greater than or equal to 0.04
The z statistic for a one-sided test is z* = 2.327. This test is A. not significant at α = .005 but significant at α = .01 level B. significant at α = .005 but not at α = .01 level C. significant at all levels D. not significant at either α = .005 nor α = .01 level E. not significant at all levels F. significant at both α = .005 and α = .01 level An experiment was...
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SECTION 6.2 SUMMARY e A test of significance i A test of significance is intended to assess the evidence provide against a null hypothesis Ho in favor of an alternative hypothesis Ha . The hypotheses are stated in terms of population is a statement that no effect or no difference is present, and Ha says there is an effect or difference in a specific direction (one-sided...
Describe a test of significance on the mean of a population by stating 1. a population, 2. a quantitative variable on that population, 3. the population standard deviation of that variable (with units), 4. a null hypothesis, 5. an alternative hypothesis, 6. an α-level, 7. a sample size, and 8. a sample mean of that variable (with units). Find 9. the one-sample z-statistic and either 10. reject or fail to reject the null hypothesis. What does this tell us about...
Test the claim about the population mean μ at the level of significance α. Assume the population is normally distributed. Write out null and alternative hypotheses, your critical t-score and your t-test statistic. Decide whether you would reject or fail to reject your null hypothesis. Test the claim about the population mean μ at the level of significance α. Assume the population is normally distributed. Write out null and alternative hypotheses, your critical t-score and your t-test statistic Claim μ...
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98. The tail area above a test statistic value of z- 1.812 is 0.035. Determine whether each of the following statements is true or false. A) If the alternative hypothesis is of the form Ha: μ> μ , the data are statistically significant at significance level α 0.05. B) If the alternative hypothesis is of the form Ha: μ > μ, the data are statistically significant at significance level α-0.10. C) If the...
A sample mean, sample size, and population standard deviation are provided below. Use the one-mean z-test to perform the required hypothesis test at the 10% significance level. x=37, n = 31, σ=9, H0 : μ=39, Ha: μ<39 EB Click here to view a partial table of areas under the standard normal curve. The test statistic is z- (Round to two decimal places as needed.)