Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
9th Edition
ISBN: 9781337098120
Author: Frederick J Gravetter, Larry B. Wallnau, Lori-Ann B. Forzano
Publisher: Cengage Learning
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Textbook Question
Chapter 15, Problem 8P
A communications company has developed three new designs for a cell phone. To evaluate consumer response, a sample of 120 college students is selected and each student is given all three phones to use for one week. At the end of the week, the students must identify which of the three designs they prefer. The distribution of preference is as follows:
- a. Do the results indicate any significant preferences among the three designs?
- b. Compute Cohen’s w to measure the size of the effect.
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A communications company has developed three new designs for a cell phone. To evaluate consumer response, a sample of 120 college students is selected and each student is given all three phones to use for one week. At the end of the week, the students must identify which of the three designs they prefer. The distribution of preference is as follows:
Do the results indicate any significant preferences among the three designs?
Compute Cohen’s w to measure the size of the effect.
From the previous market survey on five different types of soft dringk A, B , C, D and E conducted in 2010, it is evident that 17% customers prefer A, 10% prefer B, 20% prefer C, 25% prefer D and rest of them prefer E. The company is intended to examine whether the current distribution of preference for these products differ from the 2010 preference. In a recent market survey on 200 custmers, each was asked which one he/she prefer. The results were as follows: 40 prefer drink A; 47 prefer B; 38 drink C; 35 prefer D, and 40 prefer E. Test whether the current distribution of preference differ from the existing distribution of preference. Use 5% level of significance for your conclusion. Show the p-value in graph.
Quinn, a market analyst at Chips 4U vending machine company, wants to determine the best allocation of snacks throughout schools in a school district where the company recently won a contract to install snack machines. In particular, Quinn wants to determine whether there is a relationship between grade level and snack preference. A random sample of 130 students is surveyed, and their school level and preferred snack are given in the table.
SNACK
granola bar
peanuts
pretzels
chocolate bar
TOTAL
ELEMENTARY
32
10
17
20
79
Expected:
HIGH SCHOOL
15
7
20
9
51
Expected:
TOTAL
47
17
37
29
130
Complete the contingency table by entering the expected values (round to 2 decimal places). Then conduct an appropriate hypothesis test at alpha=0.02 .
Determine the null and alternative hypotheses.
�0: Grade level and student snack preferences both follow a uniform distribution.��: Grade level and student snack preferences follow some other distribution.…
Chapter 15 Solutions
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Ch. 15.1 - Which of the following is a characteristic of...Ch. 15.1 - Which of the following accurately describes the...Ch. 15.1 - A researcher uses a sample of n = 60 participants...Ch. 15.2 - Prob. 1LCCh. 15.2 - Prob. 2LCCh. 15.2 - A researcher uses a sample of 20 college...Ch. 15.3 - If a chi-square test for independence has df 3,...Ch. 15.3 - Prob. 2LCCh. 15.3 - Prob. 3LCCh. 15.4 - Prob. 1LC
Ch. 15.4 - A researcher obtains X2 = 4.0 for a test for...Ch. 15.4 - Under what circumstances should the chi-square...Ch. 15.5 - Prob. 1LCCh. 15.5 - Prob. 2LCCh. 15 - Prob. 1PCh. 15 - The student population at the state college...Ch. 15 - A developmental psychologist would like to deter...Ch. 15 - Data from the Department of Motor Vehicles...Ch. 15 - A psychologist examining art appreciation selected...Ch. 15 - A professor in the psychology department would...Ch. 15 - Automobile insurance is much more expensive for...Ch. 15 - A communications company has developed three new...Ch. 15 - Prob. 9PCh. 15 - Earlier in the chapter, we introduced the...Ch. 15 - Liu el al. (2015) recently reported the results of...Ch. 15 - Many businesses use some type of customer loyalty...Ch. 15 - In a classic study, Loftus and Palmer (1974)...Ch. 15 - In a study investigating freshman weight pain, the...Ch. 15 - Research results suggest that IQ scores for boys...Ch. 15 - Gender differences in dream content are well...Ch. 15 - Many parents allow their underage children to...Ch. 15 - A recent study indicates that people tend to...Ch. 15 - Research indicates that people who volunteer to...Ch. 15 - Research has demonstrated strong gender...
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