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A bank wishes to estimate the mean credit card balance owed by its customers. The population standard deviation is estimated to be $313. If a 98 percent confidence interval is used and an interval of $76 is desired, how many customers should be sampled?
The average delivery time is 26.7 with a standard deviation of 8.527. If the customer estimates the time using a 99% confidence interval, what is the margin of error?
Assume in a single game sudden death playoff between team A and team B that team A would win with probability 0.6.
Set up the null and alternative hypothesis to test the researcher's prediction.
the grains composing polycrystalline metals tend to have weights that follow a log-normal distribution. for a type of
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
Assume that a simple random sample of a population has been selected from a population that has a normal distribution, Use the formula for X2( chi square distribution) and the chi-square distribution table
as a commercial buyer for a private supermarket brand suppose you take a random sample of 12 cans of beans packed at a
Applicants with exam scores in the lower 10% are directed to special retraining. What is the minimum score required to not be directed to retraining?
the city council of pine bluffs is considering increasing the number of police in an effort to reduce crime. before
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
a company produces bolts for large-scale construction projects. the shear strength x of the bolts is assumed to be a
A recent article in theWall Street Journal reported that the prime rate for large banks now exceeds 9 percent. A sample of eight small banks in the Midwest revealed the following prime rates (in percent):
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