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- Which one of the following is not a property of a good estimator? a. Unbiased b. Efficient c. Consistent d. BiasedFollowing are summary statistics for two data sets, A and B. A B Minimum 0.066 -2.235 1st Quartile 1.42 5.27 Median 2.60 8.03 3rd Quartile 6.02 9.13 Maximum 10.08 10.51 Compute the interquartile ranges for both A and B. b. Do the summary statistics for A provide enough information to construct a boxplot? If so, construct the boxplot. If not, explain why. Do the summary statistics for B provide enough information to construct a boxplot? If so, construct the boxplot. If not, explain why. a. C.Select the statistic test that best fits each description. Study to investigate whether a significant difference exists between male and female students on a math test. A. T-test independent samples B. T-test dependent samples C. One-way ANOVA D. Correlation E. Chi square F. Simple Regression
- Which one of the following histograms could represent a distribution of salaries paid at a financial company with many low level analysts, few top-ranking employees, and one CEO? Om OM 01A Pearson correlation coefficient is calculated for 38 individuals. What value is df should be used to determine statistical significance in hypothesis tesing? a. 35 b. 36 c. 37 d. 382. The heights and arm spans of 10 adult males were measured (in cm). Is there a significant correlation between these two measurements? Carry out an appropriate analysis. Height (cm) Span (cm) 171 173 195 193 180 188 182 185 190 186 175 178 177 182 178 182 192 198 202 202
- Students in Psyc 210 have found a relationship between practice quizzes and final grade; the more practice quizzes the higher the grade they earned. Which of the following tests is appropriate for this study? a. Two-Factor ANOVA b. Correlation c. Repeated-Measures ANOVA d. ANOVA7.88 Average service time. Another benchmark that was measured in the QSRMagazine.com drive- thru study, described in Exercise 7.49 (page 430), was the service time.45 A summary of the results (in seconds) for two of the chains is shown below: Chain Taco Bell McDonald's n 165 165 2 240.38 289.05 36.3 40.7 a. Is there a difference in the average service time between these two chains? Test the null hypothesis that the chains' average service time is the same. Use a significance level of 0.05. b. Construct a 95% confidence interval for the difference in average service time. c. Lex plans to go to Taco Bell and Sam to McDonald's. Is the interval in part (b) likely to contain the difference in their service times they encounter? Explain your answer.Each of the digits in a raffle is thought to have the same chance of occurrence. The table shows the frequency of each digit for consecutive drawings in a California lottery. Perform the chi-square test to see if you reject the hypothesis at the 0.05 significance level that the digits are from a uniform population. Digit Frequency Digit Frequency 0 43 5 46 1 41 6 39 2 45 7 40 3 41 8 39 4 47 9 29 Click here for the Excel Data File a. State the decision rule. Use 0.05 significance level. (Round your answer to 3 decimal places.) H0: The digits are uniformly distributed.H1: The digits are not uniformly distributed. b. Compute the value of chi-square. (Round your answer to 3 decimal places.)
- The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey &8 employees. The number of sick days they took for the past year are as follows: 12; 6; 15; 3; 10; 8; 8; 8. Let X= the number of sick days they took for the past year. Should the personnel team believe that the mean number is about 10? Conduct a hypothesis test at the 5% level. What is the test statistic? (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) What is the p-value? (Round your answer to four decimal places.) Construct a 95% confidence interval for the true mean. Sketch the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence interval. (Round your answers to three decimal places.)An intelligence test that has a maximum time for completion of 45 minutes was recently administered to a group of 21 people. Their respective times for completion (in minutes) were as follows. 22, 29, 31, 31, 31, 33, 36, 36, 37, 37, 37, 37, 37, 41, 41, 41, 42, 42, 43, 43, 44 Send data to calculator Send data to Excel Frequency 8. 8. 7 6- 4 4 2. 1 20 25 Time for completion (in minutes) 30 35 45 40A school principal claims that the number of students who are tardy to school does not vary from month to month. A survey over the school year produced the following results. Using a 0.01 level of significance, test a teacher's claim that the number of tardy students does vary by the month. Number Aug. Oct. Sept. 18 13 19 Tardy Students Nov. Dec. Jan. 14 8 Feb. Mar. Apr. 6 13 11 15 May 16 Copy Data Step 2 of 4: Calculate the expected value for the number of tardies in October. Enter your answer as a fraction or a decimal rounded to three decimal places.
