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Diameter of ball bearings are distributed normally.The mean diameter is 124 millimeters and the standard deviation is 5 millimeters. Find the eprobality that the diameter of a selected ebaring is between 128 and 132 millimeterds.
Type the above data into the SPSS Data Editor window, or save this file as an unformatted text file and write SPSS syntax to read it in.
Let μ be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number (more than 30) of such workers yielded a 95% confidence interval for μ of $8.46 to $9.86 using the normal distributio..
Todd is less interested in testing a hypothesis than he is in developing an estimate for what people would be willing to pay. He would like 95% confidence intervals for the average price people would be willing to pay
Using a significance test, evaluate whether or not there has been a change in the percent of Internet users who download music. Provide all details for the test. (Round your value for z to two decimal places. Round your P-value to four decimal pla..
A random sample of 121 checking accounts at bank showed an average daily balance of $280 the standard deviation of the population is known to be $6. Find the standard error of the mean.
For a group of 10 men subjected to a stress situation, the mean number of heartbeats per minute was 126, and the standard deviation was 4. Find the 95% confidence interval of the true mean.
Assume that the duration of human pregnancies can be described by a normal model with mean 268 days and standard deviation 17 days. What percentage of pregnancies should last between 260 and 270 days?
A random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a) What is the probability that the sample mean will have a value between 45 and 55?
Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is approximately normal. Find P90.
Assume salaries are normally distributed with a standard deviation of $4,500. What is the probability of a new graduate receiving a salary between $45,000.
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
Describe a series of steps that could be used to write fractions like 3/4, 2/5, 5/6, 11/8, 3/10, 19/15, 7/20, 8/25, 9/40, or 17/50 in decimal form.
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