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The following data represents the amount of time ( in minutes ) that a person had to wait for a bus to work on a random sample of 5 working days.
6--8--5--7--5
Assume that waiting times are approximately normally distributed.
Construct a 98% confidence interval for the population mean of waiting times.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
Explain how much money do these people make each year. Suppose you read in your local newspaper that 45 officials in student services whioch is earned as an average.
Testing for population mean - What happens as you use different levels of significance? Different values of the standard deviation?
Normal distribution has mean of 80 and standard deviation of 14. Find out the value above which 80 percent of values will occur.
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
ABC Corporation of California publishes a variety of statistics, including the number of individuals who got a new job during the past 12 months and the mean length of time the individuals have been on the job.
To forcast the sample size within 0.02 with 90 percent confidence. The CEO of the organization needs to forcast the proportion of Canadians who own their house.
Is your sample of MSU students significantly different from the population of MSU students in terms of the number of classes they take per semester (use alpha level .05)? To answer this question, follow all of your steps for hypothesis testing.
The time, in hours, that a copying machine may work without breaking down is the normally distributed random variable with mean 549 and the standard deviation 68.
Costs of Televisions Listed below are prices (in dollars) and quality rating scores of rare-projection televisions (based on data from Consumer Reports). All of the televisions have screen sizes of 55 in or 56 in.
Test the claim that the mean age of the prison population in one city is less than 26 years. Sample data are summarized as n = 25, x = 24.4 years, and s = 9.2 years. Use a significance level of α = 0.05.
At.05 significance level, can we conclude that larger proportion of the agents think the economy is expanding this month?
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