Business Statistics: A First Course (8th Edition)
8th Edition
ISBN: 9780135177785
Author: David M. Levine, Kathryn A. Szabat, David F. Stephan
Publisher: PEARSON
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A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05. If the sample data produce a z-score of z = -2.24, which is the correct decision?
In a one-tail hypothesis test where you reject H0 only in the upper tail, what is the critical value of the t-test statistic with 10 degrees of freedom at the 0.01 level of significance?
A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores. The hypothesis test produces a z-score statistic of z= 1.23 , if the researcher is using a one-tailed test, what is the correct statistical decision?
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- What is meant by the sample space of an experiment?arrow_forwardWhat is an experiment?arrow_forwardClassify the hypothesis test as two-tailed, left-tailed, or right-tailed. In 1994, the average durationof long-distance telephone calls originating in one town was 6.6 minutes. A long- distance telephone company wants to perform a hypothesis test to determine whether the average duration of long-distance phone calls has changed from 1994 mean of 6.6 minutes. two-tailed O left-tailed O right-tailedarrow_forward
- What is the p-value of a right-tailed one-mean hypothesis test, with a test statistic of z0=2.05? (Do not round your answer; compute your answer using a value from the table below.)arrow_forwardCalculate the p-value for a two-tailed hypothesis test with test statistic z = - 1.80 that is:arrow_forwardIn a study to test the effectiveness of barbless fishing hooks, 855 fish were caught with this type of hook, the hook was removed, and the fish was released. 26 of the released fish died. Suppose the hypotheses are H0: p = .04 and Ha: p < .04. What is the standardize test statistic (z-score) of the hypothesis test? A. -1.431 B. 0.05 C. 0.0304arrow_forward
- For a one-tailed (upper tail) hypothesis test with a sample size of 26 and a .01 level of significance, the critical value of the test statistic t isarrow_forwardIf a sample of 50 individuals was taken from a population with a standard deviation of 12 and the sample mean is 95, what is the t-statistic for a two-tailed hypothesis test at a significance level of 0.05?arrow_forwardFor a lower tail hypothesis test with a sample size of 13 and a .10 level of significance, the critical value of the test statistic t isarrow_forward
- Identify the appropriate hypothesis test (aka, which inferential statistic) for each of the following research situations (z for X, z for M, single sample t, indepen. t, repeated t, indepen ANOVA, repeated ANOVA, Pearson correlation, Spearman correlation, Regression, Chi-Square). A researcher conducts a cross-sectional developmental study to determine whether there is a significant difference in vocabulary skills between 8-year-old and 10-year-old children. Two group of children are used (8-year-olds and 10-year-olds) and the researchers make sure the children are similar on all important individual differences 1.A researcher determines that 8% of the males enrolled in Introductory Psychology have some form of color blindness, compared to only 2% of the females. Is there a significant relationship between color blindness and gender? 2. A researcher records the daily sugar consumption and the activity level for each of 20 children enrolled in a summer camp program. The…arrow_forwardFind the P value for a left-tailed hypothesis test with a test statistic of z=-1.17. Decide whether to reject the null hypothesis if the level of significance =0.05.arrow_forwardA researcher examines whether a majority of individuals prefer to wear their seat belts when driving by counting seat belt wearing tendencies among a sample. The statistical test that should be used when conducting the hypothesis test is a chi-square test of goodness of fit. True or False?arrow_forward
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