1. A coffee is interested in daily consumption of coffee drinkers The informatio
ID: 3231565 • Letter: 1
Question
1. A coffee is interested in daily consumption of coffee drinkers The information is summarized below. Statistic Regular coffee drinkers Decaffeinated coffee drinkers Sample size Sample mean 5.15 5.85 Population standard deviation 1.40 1.25 At the 0.05 significance level, is there a difference in the mean daily consumption of regular-coffee drinkers and decaffeinated-coffee drinkers? a. State the null and alternative hypotheses. b. What is the critical value of the test? c. What is the decision rule? d. Using the critical value approach, state your decision regarding Ho 2. The following is a partial ANOVA table regarding the service satisfaction on five auto body shops. 35 customers were surveyed. Use a 0.05 Sum of Squares Mean Square Source 18.5 Between Within Groups Total a. Complete the table by filling in missing information (marked as b. State the null hypothesis and the alternative hypothesis. c. What is the value of statistic? d. hat is your conclusion regarding the service satisfaction among five shops?Explanation / Answer
Answer to the questions below:
a.
Ho:Mu>500
Ha:Mu<=500
b. Zc = (505-520)/(70/sqrt(49)) = -1.5
c. The decision rule is that if Z<-1.96 then we reject null and accept the claim
d. Since Z>Zc. We conclude that the claim of the insurance company about reducing the mean amount of claim is NOT right
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