INTRODUCTION TO STATISTICS & DATA ANALYS
6th Edition
ISBN: 9780357420447
Author: PECK
Publisher: CENGAGE L
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Textbook Question
Chapter 10.4, Problem 55E
The authors of the paper “Changes in Quantity, Spending, and Nutritional Characteristics of Adult, Adolescent and Child Urban Corner Store Purchases After an Environmental Intervention” (Preventative Medicine [2015]: 81–85) wondered if increasing the availability of healthy food options would also increase the amount people spend at the corner store. They collected data from a representative sample of 5949 purchases at corner stores in Philadelphia after the stores increased their healthy food options. The sample
- a. Notice that for this sample, the sample standard deviation is greater than the sample mean. What does this tell you about the distribution of purchase amounts?
- b. Before the stores increased the availability of healthy foods, the population mean total amount spent per purchase was thought to be about $2.80. Do the data from this study provide convincing evidence that the population mean amount spent per purchase is greater after the change to increase healthy food options? Carry out a hypothesis test with a significance level of 0.05.
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299
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Click here for the Excel Data File
(a-1) Choose the correct row-effect hypotheses.
a.
H0: A1 ≠ A2 ≠ A3 ≠ 0
⇐⇐ Temperature means differ
H1: All the Aj are equal to zero
⇐⇐ Temperature means are the same
b.
H0: A1 = A2 = A3 = 0
⇐⇐ Temperature means are the same
H1: Not all the Aj are equal to zero
⇐⇐ Temperature means differ
a
b
(a-2) Choose the correct column-effect hypotheses.
a.
H0: B1 ≠ B2 ≠ B3 ≠ 0
⇐⇐…
NutritionResearchers compared protein intake among threegroups of postmenopausal women: (1) women eating astandard American diet (STD), (2) women eating a lactoovo-vegetarian diet (LAC), and (3) women eating a strictvegetarian diet (VEG). The mean ± 1 sd for protein intake(mg) is presented in Table 12.29.
12.5 Using the data in Table 12.29, perform a multiplecomparisons procedure to identify which specific underlyingmeans are different.
Chapter 10 Solutions
INTRODUCTION TO STATISTICS & DATA ANALYS
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