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A professor tests whether the loudness of noise during an exam (low, medium, and high) is independent of exam grades (pass, fail). The following table shows the observed frequencies for this test.
Noise Level: Low Medium High
Exam Pass 19 16 9 44
Fail 9 5 11 25
28 21 20 N = 69
(a) Conduct a chi-square test for independence at a 0.05 level of significance. (Round your answer to two decimal places.)
=
Decide whether to retain or reject the null hypothesis.
Retain the null hypothesis.
Reject the null hypothesis.
(b) Compute effect size using Cramer's V. (Round your answer to two decimal places.)
V =
If we use the Empirical Rule, sales will be between what two values on 68 percent of the days? Sales will be between what two values on 95 percent of the days?
A drama fan has taped 9 episodes (on nine different videotapes)of a drama. however, he only has time to watch four episodes. suppose he selects four tapes at random. How many different ordered arrangements of episodes are possible?
in the annual report a major food chain stated that the distribution of daily sales at its detroit stores is known to
Based on the above information, conduct a Chi-squared Goodness-of-Fit Test at 1% significance level.
After completing the program, the mean pulse rate of the students was 64.1.Test the hypothesis that the program lowered students' pulse rates using a = 0.01.
A population of 600 votrs contains 258 Republicans, 294 Democrats, and 48 independents and members of other parties.
According to Catalyst, 14.3% executive positions in Fortune 500 companies are occupied by women in 2012. A random sample of 180 Fortune 500 executives was selected. What is the probability that 20% or less of this sample were women?
The following data are the weight in decagrams of 6 seed packets distributed by a company 41.94, 48.02, 45.44, 46.28, 42.72, 47.15
The means appear to be very close, but not the variances. (a) At α = .05, is there a difference in variances? (b) Show all steps clearly, including an illustration of the decision rule.
The drive-thru times at Tim Horton's are normally distributed with µ = 138.5 seconds and s = 29 seconds.
The regression analysis at the bottom relates average annual per capita beef consumption (in pounds) and the independent variables "average annual per capita pork consumption" (in pounds) and "average annual beef price" (in dollars per pound)
Why is managing staffing important financially in health care organizations?
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