) A sample of eight observations of variables x and y is shown below: x 5 3 7 9 2 4 6 8 y 20 23 15 1 answer below »

) A sample of eight observations of variables x and y is shown below: x 5 3 7 9 2 4 6 8 y 20 23 15 11 27 21 17 14 Find the value of coefficient of correlation, r. a) – 0.991 b) 0.872 c) – 0.512 d) 0.942 2) In the past, young women drivers have maintained a better driving record than young men drivers. An insurance company is concerned with the driving record of its insured customers. Specifically, it conducts a test for the number of speeding tickets received during the past year by drivers between the ages of 18 and 25. Men Women n1= 120 n2= 85 1= 1.2 2 = 0.4 s21 = 24.8 s22 = 10.6 A test for the equality of average number of tickets per driver for the two groups is desired. Use = 0.01. Calculate the p-value for this test. A) 0.3395 B) 0.2015 C) 0.1646 D) 0.4561 3) A producer of a juice drink advertises that it contains 10% real fruit juices. A sample of 75 bottles of the drink is analyzed and the percent of real fruit juices is found to be 6.5%. If the true proportion is actually 0.10, what is the probability that the sample percent will be 6.5% or less? a)0.7211 b)0.1562 c)0.5488 d)0.8325 4) One-way ANOVA is performed on three independent samples with: = 6, = 7, and = 8. The critical value obtained from the F-table for this test at the 2.5% level of significance equals: a)3.55 b)39.45 c)4.56 d)29.45 5) We calculate the three-period moving average for a time series for all time periods except the: A) first period B) last period C) first and last period D) first and last two periods

 

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