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A retail store executive wants to know whether the store's Internet sales exceed its mailorder sales. A random sample of 15 Internet sales yielded a mean sale amount of $86.40, with a standard deviation of $18.75. A random sample of 10 mail-order sales yielded a mean sale amount of $75.20, with a standard deviation of $14.25. Do these data indicate that the true mean Internet sale amount exceeds the true mean mail-order sale amount? Perform the test of hypothesis assuming that the population variances are equal and that two populations from which the samples are drawn are normally distributed. Use a significance level of α = .01.
The American Bar Association conducted a survey in 1986 showed that the average income of lawyers in 1986 was $ 120,000. An investigator took a sample of 64 lawyers in 1990, produced a median income of $ 140,000 with a standard deviation of $ 24.5..
what is the probability that the mean of a random sample will be equal to or greater than the 97.5 percentile of its
If a randomly selected student does not live in the dormitory, what is the probability that the student is a freshman?
the wechsler iq test has a normal shape withnbspmu100 andnbspsigma15. nbspif you take a random sample of n144 students
Identify the treatment variable and the response variable.Can you conclude that the increase in Medicaid caused the good results? Why or why not?
Which of these following statements provides the best guidance for the model building?
Assuming a normal distribution with a standard deviation of $200, what is the probability that a randomly selected golfer in this age group will have spent:
Describe the collapse of the Soviet Union. Begin with the events during the 1980s including the entire Gorbachev era. Should include at least the following topics:
Another hand. You pick three cards at random from a deck. Find the probability of each event described below.
Criticize the following definitions in light of the eight rules for lexical definitions:- Satire is a kind of glass, wherein beholders do generally discover everybody's face but their own.
Smartphone adoption among American young adults has increased substantially. Create your own situation that could be modelled with a binomial probability
If the scientist is correct, and the world does not take her seriously, would this be a Type I error or a Type II error? Briefly explain your reasoning.
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