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Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test, the Type I error is:
a. to conclude that the current mean hours per week is higher than 4.5, when in fact, it is higher
b. to conclude that the current mean hours per week is higher than 4.5, when in fact, it is the same
What is the probability that an exact-change toll booth is selected?- What is the probability that a manual-collection toll booth or the token toll booth is selected?
As part of an opinion survey, a simple random sample of 1,500 families is chosen. What is the chance that between 9% and 11% of the sample families will not own cars?
A random sample of 24 groups of adults has a mean daily lodging cost of $233 and a standard deviation of $12.50. Is there enough evidence to reject the claim at α= 0.10? Assume the population is normally distributed.
a real estate agency wants to compare the appraised value of single-family homes in two central austin neighborhoods. a
Suppose 20% of the people in a city prefer Pepsi-Cola as their soft drink of choice. If a random sample of six people is chosen, the number of Pepsi drinkers.
Summarize the data by giving the estimates of the two population proportions and a 95% confidence interval for their difference. Briefly summarize what the data show.
Keep a diary of your purchases for two weeks. Select five or more of the products you purchased during that period
1. a study sponsored by american express co. and the french government tourist office found that old american
Construct a 95% jackknife con?dence interval for the average percentage of impurities in this brand of peanut butter. Give an approximate 95% jackknife con?dence interval for the population variance.
Plot stem-and-leaf plot and boxplot for Mtotal. Illustrate hand calculation of median location and upper hinge location of boxplot, and determine their corresponding data values.
where t is in hours, and λ{t) = λ{t - 24), for t ≥ 24. Furthermore, the duration (in minutes) of a call received at night has a uniform distribution on the interval (0,2], whereas the duration of a call received during the day has
Suppose the lot consists of ten boards, of which two are green. Does the assumption of independence now yield approximately the cor- rect answer for P(A n B)? What is the critical difference between the situation here and that of part (a)?
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