To determine the effect of advertising in the Yellow Pages. Bell Telephone took a sample of...

To determine the effect of advertising in the Yellow Pages. Bell Telephone took a sample of 40 retail stores that did not advertise in the Yellow Pages last year but did so this year. The annual sales (in thousands of dollars) for each store in both years were recorded.

a. Estimate with 90% confidence the improvement in sales between the 2 years.

b. Canwe infer at the 5% significance level that advertising in the Yellow Pagesimproves sales?

c. What are the required condition(s) of the techniques used in parts (a) and (b)?

This Year	Last Year
189	151
225	224
106	30
146	132
234	233
233	213
210	197
107	81
213	209
174	165
209	208
237	251
190	144
159	154
176	160
145	96
294	257
141	81
197	166
156	170
167	257
224	231
250	195
210	221
257	211
197	183
203	180
190	127
202	170
191	177
249	236
196	154
183	143
192	168
217	154
104	102
275	242
137	82
128	148
159	179

Expert Solution

Solution...

Part A:

Part B:

Hypothesis (as stated above) is same for this case also...

Part C will be given soon...

End...

orchestra answered 2 years ago

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