QNT 561 Week 4 Lab Work (New)
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QNT 561 Week 4 Lab Work (New)

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Chapter 10: Ex 2) A Sample of 36 observations is selected from a normal population. The sample mean is 12, and the population standard deviation is 3. Conduct the following test of hypothesis using the 0.01 significance level. EX. 10) Given the following hypotheses: H0 : µ = 400 H1: µ ≠ 400 A random sample of 12 observations is selected from a normal population. The sample mean was 407 and the sample S.D 6. Using the 0.1 significance level: a. State the decision rule. b. Compute the value of the test statistic c. What is your decision regarding the null hypothesis? EX 12) The management of White Industries considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of sample was 2.7 minutes. Using the .10 level of significance, can we conduct that the assembly time using the new method is faster? a. What is the decision rule? b. Compute the value of test statistic. c. What is your decision regarding Ho? Ex 16) with the given hypotheses: A random sample of six resulted in the following values: 118, 105, 112, 119, 105 and 111. Assume a normal population a. Using the .05 significance level, determine the decision rule? b. Compute the value of the test static. c. 1. What is your decision regarding the Ho? 2. Can we conclude the mean is different from 100? d. Estimate the p-value Chapter 11: Ex 2) A sample of 65 observations is selected from one population with a population standard deviation of 0.75. The sample mean is 2.67. A sample of 50 observations is selected from a second population with a population standard deviation of 0.66. The sample mean is 2.59. Conduct of the following test of hypothesis using the .08 significance level. a. This is a ……… tailed test b. State the decision rule c. Compute the value of the test statistic d. What is your decision regarding Ho? e. What is the p-value? Ex 8) The null and alternate hypotheses are: A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample S.D of 12. A random sample of 17 observations from the second population revealed a sample mean of 342 and a sample S.D of 15. At the .10 significance level, is there a difference in the population means? a. This is a ……… tailed test b. The decision rule is to reject …….. c. The test statistic is t= ……….. d. What is your decision regarding Ho? e. The p-value is between 0.1 and 0.2? Ex 14) The null and alternate hypotheses are: A random sample of 20 items from the first population showed a mean of 100 and a S.D of 15. A sample of 16 items from the second population showed a mean of 94 and a S.D of 8. Use the .05 significance level a. Find the degrees of freedom for unequal variance test b. State the decision rule for .05 significance level? c. Compute the value of test statistic. d. What is your decision regarding null hypothesis? Chapter 12: Ex 8) The following are six observations collected from treatment 1, four observations collected from treatment 2, and five observation collected from treatment 3. Test the hypothesis at the 0.05 significance level that the treatment means are equal. a. State the null and the alternate hypothesis. b. What is the decision rule? c. Compute SST SSE, SS total d. Complete the ANOVA table. e. State your decision regarding null hypothesis? Ex 12) From the given data of retail and banking stock a. Using the .05 level of significance, is there a difference in the mean rate of return among the three types of stock? b. Can the analyst conclude there is a difference between the mean rates of return for utility and retail stocks? For utility and banking stocks? For banking and a retail stocks? Explain Ex 18) There are three hospitals in the Tulsa, Oklahoma area. The following data show the number of outpatient surgeries performed on Monday, Tuesday, Wednesday, Thursday, and Friday at a each hospital last week. At the 0.05 significance level, can we conclude there is a difference in the mean number of surgeries performed by hospital or by day of the week? a. Set up the null hypothesis and the alternative hypothesis. b. Alternative hypothesis c. For blocks d. Alternative hypothesis e. State the decision for .05 significance level f. Complete the ANOVA table g. State your decision regarding null hypothesis? h. The decision for F value at 0.05 significance is: i. Can we conclude there is a difference in the mean number of surgeries performed by hospital or by day of the week? Chapter 13: EX. 16) Mr.James McWhinney, president Daniel-James Financial Services, believes there is a relationship between number of client contacts and the dollar amount of sales. To document this assertion, Mr.McWhinney gathered the following sample information. The X column indicates the number of client contacts last month, and column Y shows the value of sales last month for each client sampled a) Determine Regression equation b) Determine Estimated sales if 40 contacts are made EX.18) We are studying mutual bond funds for the purpose of investing in several funds. For this particular study, we want to focus on the assets of a fund and its five-year performance. The question is: can the five-year rate of return be estimated based on the assets of the fund? Nine mutual funds were selected at random and their assets and rates of return are shown below. b-1. compute the coefficient of correlation. b-2. Compute the coefficient of determination c) Give a description of the degree of association between the variables d) Determine the regression equation. Use assets as the independent variable. e) For a fund with $400.0 million in sales, determine the five-year rate of return. EX.30) On the first statistics exam, the coefficient of determination between the hours studied and the grade earned was 80%. The standard error of estimate was 10. There were 20 students in the class. Develop an ANOVA table for the regression analysis of hours studied as a predictor of the grade earned on the first statistics exam. Chapter 16: Ex 16) The null hypothesis and the alternate hypothesis are: a. State the decision rule, using 0.05 significance level b. Compute the value of chi-square c. What is your decision regarding Ho?

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