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A plumbing company has found that the length of time, in minutes, for installing a bathtub is normally distributed. The owner of the company hires a statistician to estimate the average length of time for installing a bathtub by his company. The statistician randomly selects a sample of 10 bathtub installations. The sample yielded = 150 minutes and s = 30 minutes. Construct a 95% confidence interval for the average length of time for installing a bathtub by the company.
the distribution of weekly salaries at a large company is right skewed with a mean of 1000 and a standard deviation of
Families in a certain area that are living below the poverty level. If this proportion is roughly 0.15, what sample size is necessary so that the standard error of the estimate is 0.02?
there is a claim that a certain method of gender selection increases the likelihood of a baby girl the probability of a
Cars. One of the important factors in auto safety is the weight of the vehicle. Insurance companies are interested in knowing the average weight of cars.
If 8 kids within this age group who use the Internet are randomly chosen, what is the probability that 2 of them do their schoolwork on line? What is the probability that no more than 5 of them do their schoolwork on line?
a. At 95% confidence, compute the margin of error. b. Determine a 95% confidence interval for the weight of the population of bags of sugar produced by the company.
Describe the randomization process and the assignment of treatment combinations that would result in you treating this experiment as
Based on the various stepwise approaches and "best-subsets" approaches for selecting an excellent (if not optimal) fitted multiple regression model, which one approach would you select if you had to explain to a client what your chosen model is an..
An amplifier having Ri = 1M Ω, Ro = 1kΩ, and Avoc = -104 is operated with a 1-kΩ load. A source having a Thévenin resistance of 2 MΩ and an open-circuit voltage of 3 cos(200 πt) mV is connected to the input terminals. Determine the output voltage ..
Test whether the weight reducers on average will lose less than 10 pounds using P-value approach.
What percent of the investment firm's potential market sees and remembers the advertisement? What percent of the investment firm's potential market sees, but does not remember the advertisement?
If a student is selected at random, find the probability that: The student graduated high school. The student has a low reading ability, given that the student is a high school graduate
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