Take Quiz A researcher is investigating which of two newly developed automobile engine oils is better at prolonging the life of an engine. Since there are a variety of automobile engines, 20 different engine types were randomly selected and were tested using each of the two engine oils. The number of hours of continuous use before engine breakdown was recorded for each engine oil. Based on the information provided, what type of analysis will yield the most useful information? Q Matched pairs comparison of population proportions. O Matched pairs comparison of population means. 0 Independent samples comparison of population proportions. 0 Independent samples comparison of population means. Exit Take Quiz Suppose you want to estimate the difference between two population means correct to within 2.5 with probability 0.95. If prior information suggests that the population variances are both equal to the value 20, and you want to select independent random samples of equal size from the populations, how large should the sample sizes be? Qn1=n2= 25 On1=n2=18 Qn1=n2=44 On1=n2=62 * Previous Next F Exit \fTake Quiz Exit - Question 7 1 pts An online retailer wanted to see if purchasing patterns were different between urban consumers and rural consumers. Urban consumers were found to have spent a mean of $85 per month on online purchases, whereas Rural consumers were found to have spent a mean of $78 per month. An independent samples ttest was conducted to assess the observed difference between the two groups of consumers. A two-tailed test was applied. The value of the t- Test Statistic for the observed differences was 4.7, where the pvalue is less than 0.0002. What conclusion can be made about the observed difference? 0 There is statistically no significant difference between the two groups of Amman-m All!\" Take Quiz difference between the two groups of consumers. A two-tailed test was applied. The value of the t- Test Statistic for the observed differences was 4.7, where the p-value is less than 00002. What conclusion can be made about the observed difference? 0 There is statistically no significant difference between the two groups of consumers Q There is a statistically signicant difference between the two groups of consumers. Q There is not sufcient information to conclude. O The independent samples ttest is not the appropriate hypothesis-testing procedure. Exit \fTake Quiz Exit E Question 4 1 pts To assess the effect of an intervention such as the productivity of an employee before and after a training class, one would conduct a(n) O paired samples ttest 0 independent samples Itest 0 ANOVA O Ftest 'I Previous Next * Not saved Submit Quiz Take Quiz Exit A company wishes to test whether the proportion of female managers is the same as the proportion of male managers. The following table provides data for a sample of employees. --- Number of 18 23 managers Which of the following is the test statistic? Take Quiz Exit Number of 18 23 managers Which of the following is the test statistic? 4 Previous Next * Take Quiz Exit A company wishes to test whether the proportion of female managers is the same as the proportion of male managers. The following table provides data for a sample of employees. --- Number of 18 23 managers Identify the pvalue. 0 0.1483 Q 0.2966