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A polling company obtains an alphabetical list of names of voters in a precinct. They select every 20th person from the list until a sample of 100 is obtained. They then call these 100 people. Does this sampling plan result in a random sample? Simple random sample? Explain.
A journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband again.
Compute the value of t. What is your decision regarding the null hypothesis?
Construct a 90% confidence interval for the standard deviation of the number of hours this firm's employees spend on work-related activities in a typical week.
A researcher has been measuring the time for pairs of 8 year olds who have just met each other to work together to solve a problem. Construct a distribution table for these data. include the colums and values for proportion and percentage.
What is the probability that the mean annual precipitation during 49 randomly picked years will be less than 101.8 inches?
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
A certain component is critical to the operation of medical device and must be replaced immediately upon failure. If the mean lifetime of this type of component is 100 hours and its standard deviation is 30 hours, how many of these components must..
Construct a 95% confidence interval for the population mean, assuming a normal distribution?
Construct a 95% confidence interval for the population mean service charge if a customer's account falls below the $1,500 minimum.
What is 95% confidence interval estimate for average number of years served by all Supreme Court justices?
The mean of a normal probability distribution is 60; the standard deviation is 5.
Data on distribution of cost for building effort, design work and testing effort.
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