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How large a sample would you need if you want your estimate to be within .03 of the true value with a 97% confidence level and you know nothing about the population?
The manager of a paint supply store wants to determine whether the mean amount of paint contained in 1-gallon cans purchased. Compute the p-value and interpret its meaning.
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
Review the SPSS output file which reports the results of the related samples t-test to compare the number of U.S. What was the mean number of U.S. states in which all of the beer brands were sold in i
Describe a way to measure the DV so that each participant would have one score at the end that would be on a continuous scale of measurement. Support the responses.
Find the probability again using the hypergeometric formula for matching 5 of the 7 winning numbers. Round to 8 decimal places.
The the new safety equipment is effective when the mean percent reduction is actually 2.3%. Assume that the population standard deviation is 12% and that α is 0.02. What is the power?
A sample of 4 trucks is randomly selected. What is the probability that 2 of those defective have defective braked.
Find the Mean and the standard deviation of the number of hours parked. How long is a typical customer parked? Find the mean and the standard deviation of the amount charged.
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board. What is the expected number µ of board failures per year?
What is the probability Linda Lahey, company president, received exactly 1 email between 4 P.M. and 5 P.M. yesterday?
Determine the probability distribution for the number of Hondas in a sample of 3 cars chosen from the top twelve.
Find the mean and standard deviation of the payout. If the cost of a ticket is taken into account then the mean is a loss of $? And the SD is changed or unchanged?
What is the probability that of today's 1200 callers at least 5 will receive a busy signal? use the poisson approximation to the binomial.
Data for 21 companies who use the bank's services were used to construct the following model. Interpret the estimate of β0, the y-intercept of the line.
Draw a sketch of the standard normal distribution curves, one for the current process and another one for the recentered process.
The sample averages and sample ranges are in the following table. Construct and plot an x-bar chart using this data. Is the process in control?
Compute the probability that a single randomly chosen adult over 60 years old will have a daily calcium intake of OVER 1000 mg.
Using a weighted moving average with weights of 0.6, 0.3, and 0.1. The weight of 0.6 is to be attached to the most recent demand and 0.3 to the second most recent demand.
Determine the crossover point for the two options. Please give the formula for calculating crossover points, at least one step of calculation, and the correct answer for full credit.
What if the researcher compared the adolescent boys before treatment and again after treating them for depression? What type of t-test would be most appropriate in this case, and why?
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
A time series with forecast values and error terms is presented in the following table. The mean absolute deviation (MAD) for this forecast is?
The gambler is paid later as follows, depending on the number of winners he picked. What is his expected gain? Remember, a loss is a negative gain, and that the bookie keeps the gambler's $20.
Mattel Corporation produces a remote-controlled car that requires three AA batteries. What proportion of the samples will have a useful life of more than 36 hours?