EP BUSINESS STATISTICS:FIRST COURSE-ACC
8th Edition
ISBN: 9780135179802
Author: Levine
Publisher: PEARSON CO
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1. A sample of data is collected from a group of college students (X = 112, Sx = 12, N = 58). It is hypothesized that members of
this group have higher test scores than the general population (u = 100, o = 15). What test do you conduct? Don't do the test,
just name the test and list the relevant equation for the test statistic.
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A software developer wants to test if a new mobile phone app they have designed is better than a similar
existing app. In particular they wish to test the hypotheses
Ho: UN HO
and
H₁ HN > Ho
where UN is the population mean of a satisfaction rating for users of the new app and po is the population
mean satisfaction rating for users of the existing app. (The satisfaction rating is scaled so that '0'
corresponds to 'worst app ever' and '100' corresponds to 'best app ever'.)
The software developer gathers satisfaction ratings from 14 users of the new app and 18 users of the
existing app. Using the procedure for a two-sample t-test, the test statistic turns out to be 1.35.
What is the value of the critical value at the 5% significance level that this test statistic should be
compared with? (Give your answer to three decimal places.)
Answer:
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- A researcher predicts that scores in treatment A will be higher than scores in treatment B. If the mean for the n = 10 participants in treatment A is 4 points higher than the mean for the n = 10 participants in treatment B and the data produce t = 1.985, which decision should be made? a. reject H0 if α = .05 and if α = .01 b. fail to reject H0 if α = .05 and if α = .01 c. fail to reject H0 if α = .05 but reject H0 if α = .01 d. reject H0 if α = .05 but fail to reject H0 if α = .01arrow_forwardThis is mathematical statistics application question!arrow_forwardI need the answer as soon as possiblearrow_forward
- A research report concludes that there are significant differences among treatments, with "F(3, 28) = 5.62, p < .01, η2 = 0.28." If the same number of participants was used in all of the treatment conditions, then how many individuals were in each treatment? a. 6 b. 8 c. 9 d. cannot determine without more informationarrow_forward15. fast please Questions 15 – 17 refer to the following: In September 1996, 33% of adult Americans believed in haunted houses. In a Gallup Poll conducted June 2005, 370 of 1002 adult Americans aged 18 or older believed in hunted houses. Is there sufficient evidence to support the claim that the proportion of adult Americans who believe in hunted houses has increased at the α = 0.05? 15. The alternate hypothesis is: p > .33 B. p > .33 C. p> .37 D. p > .37 Group of answer choices p > .33 p >or= .33 p> .37 p >or= .37 16. If the p-value is 0.0041 what is the conclusion to the test. Group of answer choices More than 37% of adult Americans believe in hunted houses More than 33% of adult Americans believe in hunted houses 33% of adult Americans believe in hunted houses 37% of adult Americans believe in hunted houses 17. A type II error for this test is: Group of answer choices To conclude that 37% of adult Americans believe in…arrow_forwardSuppose IQ scores were obtained for 20 randomly selected sets of siblings. The 20 pairs of measurements yield x = 100.88, y = 100.55, r= 0.917, P-value = 0.000, and y= -6.07 + 1.06x, where x represents the IQ score of the younger child. Find the best predicted value of y given that the younger child has an IQ of 110? The best predicted value of y is (Round to two decimal places as needed.) Question Viewer Enter your answer in the answer box. ? search 60%arrow_forward
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