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The following information was obtained from two independent samples selected from two normally distributed populations with unknown but equal variances.
Sample 1 14 15 12 13 6 14 11 12 17 19 23Sample 2 16 18 12 20 15 19 15 22 20 18 23 12 20
Construct a 95% con?dence interval for the difference between the population means and interpret.
in a random sample of 200 people 60 were found to participate. a two-sided 95 confidence interval for the true
the prices in dollars for a graphing calculator are shown below for 8 online vendors. estimate the population standard
If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will earn less than Arc?
Find the z-score for each student and indicate which one has a better relative position. An Art Major earned a grade of 46 on an exam with = 50 and s = 5.
How many waiters and busboys should report for work at the start of each time period to minimize the total staff required for one day's operation.
is there a relationship between x rate of poverty measured as percent of population below poverty level and y rates of
In an Asian country with a population of 6 million people, 60,000 deaths occurred during the year ending December 31, 1995. . What was the cause-specific mortality rate from cholera in 1995?
A scientist wants to estimate the proportion of plants with berries growing in a particular region. They want to be within 6% of the true proportion.
Suppose a large sample is selected (instead of just 10). About 95 percent of the predictions regarding sales would occur between what two values?
1. the daily flow rate of contaminant from an industrial plant is modeled by a normal random variable with a mean value
If 50 cups of coffee were measured, what is the probability that: The sample mean per cup is less than 7.8 ounces?
describe the circumstances under which the shape of the sampling distribution of p-hat is
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