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The Cambridge City Council wants to estimate the percentage of Cambridge residents who are in favor of restoring rent control protection. If in a random poll of 250 residents, 150 residents were in favor, how accurate is this result as an estimate of the proportion?
A random sample of 35 clients' receipts gave a mean of $34.70 with standard deviation s= $4.85. Find a 90% confidence interval for the average amount spent by all clients
According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time ..
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
What statement can you made by using the rule of three, about the proportion p, of all its computers which are defective?
Can you determine the number of levels used for each factor? Explain. Describe a treatment for this experiment and determine the number of treatments used.
"If you took 40 employees at random from the corporation, there is a pretty good chance the average number of days absent would be 12 or more. That's what happened to us - chance variation." Is this a good defense? Justify your answer.
Determine the least squares estimators γ and δ for this second model associated to corresponding LS estimators α and β of first model?
Determine margin of error for confidence interval in (a)?
A powerful women's group has claimed that men and women differ in attitudes about sexual discrimination. A group of 50 men (group 1) and 40 women (group 2) were asked if they thought sexual discrimination is a problem in the United States.
Use the t-distribution table to find the critical values for the indicated alternative hypothesis, level of significance, a and sample size n1 and n2. Assume that the sample are independent, normal and random. Ha: u1
What is the average time that catalog customers must wait before their calls are transferred to the order clerk? (b) What is the average number of callers waiting to place an order?
Carpet City wants to develops a means to forecast it carpet sale. The store manager believes that the store's sale are directly related to the number of new housing starts in town.
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