Author Question: In a local community there are three grocery chain stores. The three have been carrying out a ... (Read 150 times)

mpobi80 · **on:** Jun 24, 2018

In a local community there are three grocery chain stores. The three have been carrying out a spirited advertising campaign in which each claims to have the lowest prices.

A local news station recently sent a reporter to the three stores to check prices on several items. She found that for certain items each store had the lowest price. This survey didn't really answer the question for consumers. Thus, the station set up a test in which 20 shoppers were given different lists of grocery items and were sent to each of the three chain stores. The sales receipts from each of the three stores are recorded in the data file Groceries.Based on a significance level of 0.05 and these sample data, test to determine whether blocking was necessary in this example. Use a test-statistic approach.A) Since 952.6155 > 1.8673 do not reject H0 and conclude that there is an indication that blocking was not effective.
B) Since 952.6155 > 1.8673 reject H0 and conclude that there is an indication that blocking was effective.
C) Since 102.2912 > 1.8673 do not reject H0 and conclude that there is an indication that blocking was not effective.
D) Since 102.2912 > 1.8673 reject H0 and conclude that there is an indication that blocking was effective.

Question 2

The roll of a pair of dice has the following probability distribution, where the random variable is the sum of the values produced by each die:

x P(x)
2 1/36
3 2/36
4 3/36
5 4/36
6 5/36
7 6/36
8 5/36
9 4/36
10 3/36
11 2/36
12 1/36

Calculate the variance of x.
A) 5.833
B) 6.122
C) 5.666
D) 5.122