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When the background music was slow, the mean amount of bar purchases for a sample of 17 restaurant patrons was $30.47 with a standard deviation of $15.10. When the background music was fast, the mean amount of bar purchases for a sample of 14 patrons in the same restaurant was $21.62 with a standard deviation of $9.50. (a) assuming unequal variances, at ?=0.01, is the true mean higher when the music is slow?
Determine the mean and standard error of the x - bar distribution.
The pooled variance of two samples is:
What proportion of healthy adults have pulse rates that are at most beats/sec? Round your answer to at least four decimal places.
general hospital a not-for-profit acute care facility has the following cost structure for its inpatient servicesfixed
An F statistic is any statistic that follows an F distribution. Which of the following are true about F statistics and f distribution? Select all that apply
Determine the sample size necessary under the following conditions. To estimate with = 44, E = 3, and 95% confidence. To estimate with a range of values from 20 to 88 with E = 2 and 90% confidence.
Which of the following best expresses the value of using percentages in data presentation? A. Provides for the calculation of marginals.
At a = 0.05, is there a significant difference in the proportions? Find the 95% confidence interval for the differenc of the two proportions.
Use the t test to determine whether the slope of the regression model is significant at α = 0.05.
Jan finished culinary school and wants to start her own pastry business. She has a few options, and believes that a sensitivity analysis would help her to make the best business decision. She is considering three options, and is confident that..
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
a pkiggy bank contains 4 quarters 3 dimes 8 nickles and 9 pennies. what is the probability of randomly selecting a
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