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A company pays its employees an average of $15.90 an hour with a standard deviation of $1.50. If thh wages are normally distributed:
a) What percentage of workers recieve wages between $13.75 and $16.22?
b) The highest 5% of the employee hourly wage is greater than what amount?
customers arrive at the atm at the rate of 12 customers per hour and spend 2 minutes on average on all the
A study concluded that waist to hip ratios are a better predictor of 5-year survival than more traditional height-to-weight ratios.
Generate a 95% confidence interval for the difference in proportions of patients with hypertension between groups. Experimental (n=100) =14%
an article claims that movie attendance in the u.s. has declined significantly since 2008 but that there is still a
in a shipment of 12 room air conditioners there are 3 with defective thermostats. three air conditioners will be
why the test statistic for goodness-of-fit is similar to the calculation for population standard
Suppose we want to compare the observed and expected number of events among the group 250 treatments.
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
Use 9 classes. Is the histogram approximately bell shaped and symmetic? Does this agree with the results predicted by the Central Limite Theorem?
When comparing data from different distributions, what is the benefit of transforming data from these distributions to conform to the standard distribution?
Summarize the relationship between sample size and confidence level.
The following data show samples of three chain stores in three different locations in one town and the amount of dollars spent per customer per visit. At the 0.05 level, is there a difference in among the means?
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