Intro Stats
4th Edition
ISBN: 9780321826275
Author: Richard D. De Veaux
Publisher: PEARSON
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Chapter 20, Problem 15E
To determine
Test the null hypothesis.
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Do consumers spend more on a trip to Target or Walmart? Suppose researchers interested
in this question collected a systematic sample from 81 Target customers and 77 Walmart
customers by asking customers for their purchase amount as they left the stores. The data
collected is summarized by the accompanying table. Suppose researchers decide to test
the hypothesis that the means are equal. The degrees of freedom formula gives 155.63 df.
Test the null hypothesis at x = 0.01.
OA. Ho: HA-HB = 0
HA: HA-HB >0
B. Ho: HA-HB = 0
HA: HA-HB #0
OC. Ho: HA-HB=0
HA: HA-HB <0
D. Ho: HA-HB #0
HA: HA-HB=0
Compute the test statistic.
t= -3.14
(Round to two decimal places as needed.)
Find the P-value.
The P-value is
(Round to three decimal places as needed.)
n
y
S
Target
81
40
21
Walmart
77
50
19
14
8
1
(b) Test the hypothesis that whether people drink wine is independent of whether people watch tennis. Set α = .05. (Round your answer to 3 decimal places.)
Do consumers spend more on a trip to Target or Walmart? Suppose researchers interested in this question collected a systematic sample from 83 Target customers and 82 Walmart customers by asking customers for
their purchase amount as they left the stores. The data collected
formula gives 159.83 df. Test the null hypothesis at a=0.01.
Target
Walmart
summarized by the accompanying table. Suppose researchers decide to test the hypothesis that the means are equal. The degrees of freedom
83
82
y
43
52
21
18
Identify the null and alternative hypotheses. Select the correct choice below.
O A. Ho: HA -Hg = 0
HA: HA - HB >0
O B. Ho: PA -Hg = 0
HA: HA - He <0
OC. Ho: HA - Hg #0
HA: HA- HB =0
O D. Ho: HA -Hg = 0
HA: HA - He #0
Compute the test statistic.
(Round to two decimal places as needed.)
Find the P-value.
The P-value is
(Round to three decimal places as needed.)
State the conclusion. Select the correct choice below.
Chapter 20 Solutions
Intro Stats
Ch. 20.3 - A public broadcasting station plans to launch a...Ch. 20.3 - Prob. 2JCCh. 20.4 - Prob. 3JCCh. 20.4 - Prob. 4JCCh. 20.5 - Prob. 5JCCh. 20.5 - Prob. 6JCCh. 20.5 - Prob. 7JCCh. 20.5 - Prob. 8JCCh. 20.6 - Prob. 9JCCh. 20.6 - Recall the experiment comparing patients 4 weeks...
Ch. 20.6 - Prob. 11JCCh. 20 - Canada Suppose an advocacy organization surveys...Ch. 20 - Non-profits Do people who work for non-profit...Ch. 20 - Prob. 3ECh. 20 - Prob. 4ECh. 20 - Canada, deux The information in Exercise 1 was...Ch. 20 - Prob. 6ECh. 20 - Prob. 7ECh. 20 - Prob. 8ECh. 20 - Prob. 9ECh. 20 - Prob. 10ECh. 20 - Prob. 11ECh. 20 - Prob. 12ECh. 20 - Prob. 13ECh. 20 - Athlete ages, again Using the summary statistics...Ch. 20 - Prob. 15ECh. 20 - Athlete ages, ninth inning The researchers in...Ch. 20 - Prob. 17ECh. 20 - Athlete ages, overtime Repeat the test you did in...Ch. 20 - Prob. 19ECh. 20 - Prob. 20ECh. 20 - Prob. 21ECh. 20 - Prob. 22ECh. 20 - Prob. 23ECh. 20 - Prob. 24ECh. 20 - Prob. 25ECh. 20 - Prob. 26ECh. 20 - Prob. 27ECh. 20 - Graduation The U.S. Department of Commerce...Ch. 20 - Prob. 29ECh. 20 - Carpal tunnel The painful wrist condition called...Ch. 20 - Prob. 31ECh. 20 - Prob. 32ECh. 20 - Ear infections A new vaccine was recently tested...Ch. 20 - Anorexia The Journal of the American Medical...Ch. 20 - Prob. 35ECh. 20 - Prob. 36ECh. 20 - Teen smoking A Vermont study published by the...Ch. 20 - Depression A study published in the Archives of...Ch. 20 - Birthweight The Journal of the American Medical...Ch. 20 - Politics and sex One month before the election, a...Ch. 20 - Prob. 41ECh. 20 - Prob. 42ECh. 20 - Pain Researchers comparing the effectiveness of...Ch. 20 - Gender gap Candidates for political office realize...Ch. 20 - Prob. 45ECh. 20 - Prob. 46ECh. 20 - Sensitive men In the same article from Exercise...Ch. 20 - Carbs Recently, the Gallup Poll asked 1005 U.S....Ch. 20 - Food preference GfK Roper Consulting gathers...Ch. 20 - Prob. 50ECh. 20 - Hot dogs In the July 2007 issue, Consumer Reports...Ch. 20 - Prob. 52ECh. 20 - Prob. 53ECh. 20 - Prob. 54ECh. 20 - Hot dogs, last one In Exercise 53, we saw a 90%...Ch. 20 - Third load of wash In Exercise 54, we saw a 98%...Ch. 20 - Prob. 57ECh. 20 - Prob. 58ECh. 20 - Prob. 59ECh. 20 - Prob. 60ECh. 20 - Commuting A man who moves to a new city sees that...Ch. 20 - Pulse rates A researcher wanted to see whether...Ch. 20 - 63. View of the water How much extra is having a...Ch. 20 - New construction The house sales we looked at in...Ch. 20 - Cereal sugar The data below show the sugar content...Ch. 20 - Prob. 66ECh. 20 - Prob. 67ECh. 20 - Prob. 68ECh. 20 - Prob. 69ECh. 20 - Prob. 70ECh. 20 - Prob. 71ECh. 20 - Prob. 72ECh. 20 - Prob. 73ECh. 20 - Prob. 74ECh. 20 - Prob. 75ECh. 20 - Ad campaign You are a consultant to the marketing...Ch. 20 - Prob. 77ECh. 20 - Thirsty? Researchers randomly assigned...Ch. 20 - Prob. 79ECh. 20 - Prob. 80ECh. 20 - 81. Running heats In Olympic running events,...Ch. 20 - Prob. 82ECh. 20 - Tees Does it matter what kind of tee a golfer...Ch. 20 - Golf again Given the test results on golf tees...Ch. 20 - Music and memory Is it a good idea to listen to...Ch. 20 - Rap Using the results of the experiment described...
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- A researcher conducts a hypothesis test using a sample from an unknown population. If df = 30 for the t-statistic and M = 46 and s2 = 10, how many individuals were in the sample?arrow_forwardAccording to shopper data, 97% of households purchase toilet paper. An analyst believes this is too low. To investigate, the analyst selects a random sample of 500 households and finds that 98% of them purchase toilet paper. Do these data provide convincing statistical evidence at the α = 0.05 level to conclude that the true proportion of all households that purchase toilet paper differs from 0.97? Complete the “State” step for this test. H0: p = Ha: p where p = the true proportion of all that .arrow_forwardDo consumers spend more on a trip to Target or Walmart? Suppose researchers interested in this question collected a systematic sample from 81 Target customers and 77 Walmart customers by asking customers for their purchase amount as they left the stores. The data collected is summarized by the accompanying table. Suppose researchers decide to test the hypothesis that the means are equal. The degrees of freedom formula gives 155.63 df. Test the null hypothesis at x = 0.01. Identify the null and alternative hypotheses. Select the correct choice below. OA. Ho: HA-HB=0 HA HA HB >0 B. Ho: HA HA HA OC. Ho: HA HB 0 HB #0 HB=( 0 HA HA HB<0 OD. Ho: HA-HB #0 HA HA HB=0 Compute the test statistic. t= (Round to two decimal places as needed.) y S Target 81 40 21 Walmart 77 50 19arrow_forward
- A hairdresser wanted to see if her clients bought more products at the end of their appointment if they were given lots of compliments. She decided to test this theory using an experiment. She randomly assigned 24 clients to receive either zero compliments, 5 compliments, or 10 compliments during their appointment. She recorded how many products they purchased after their appointment as her DV. She firstly hypothesised that no-compliment clients (M = 0.38) would purchase fewer products than clients who received 5 compliments (M = 1.50). She secondly hypothesised that 5-compliment clients would purchase fewer products than 10-compliment clients (M = 3.63). Thus, she conducted two comparisons. The initial ANOVA was significant. Using an alpha of .05, results for the follow-up tests confirmed her first hypothesis, with an obtained t value of 2.60, but did not confirm her second hypothesis, with an obtained t value of 1.20. She later realised that she did not use a Bonferroni-corrected…arrow_forward13:33 ull ? A alms-cdn.gelisim.edu.tr exercise - A researcher wishes to try three different techniques to lower the blood pressure of individuals diagnosed with high blood pressure. The subject are randomly assigned to three groups; the first group takes medication, the second group exercises, and the third group follows a special diet. After four weeks, the reduction in each person's blood pressure is recorded. At a = 0.05, test the claim that there is no difference among the mea The data are shown: - Medication Exercise Diet 10 6. 12 8 9 9. 3 12 15 8 13 4. EPI8OSpring 2008arrow_forwardAt α = 0.01, check whether the shoe number differs between male and female students. In the attachment, you send only PART of the data, what the data looks like.arrow_forward
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