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A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
If 50 cups of coffee were measured, what is the probability that: The sample mean per cup is less than 7.8 ounces?
In comparing the two variances below, what is the test value and what are the degrees of freedom that should be used?
Draw suitable distribution curve indicating position of the TS and CV.
Probability values based on normal distribution - old exit exam followed a normal distribution
If Molly and Kathleen wishes to make a profit of $5,000 for summer, how many pupils do they require to enrol?
There're several advantages of using a paired t-test. Since the same subjects are being tested in each of the varying conditions, those subjects serve as their own control.
To decrease the amount of time it takes to deliver packages, a delivery company purchased computer software that finds the optimal route for making deliveries based upon the input of the package destinations.
At one excavation site 8641 pot shards have been found that not yet been cleaned and identified. What is the probability that:
Create a 90% confidence interval for mean score on this placement exam for all students.
Prepare a frequency distribution from data given below that describes how long it took a person to drive to work in work week.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows:
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