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An experiment is conducted in which 60 participants each fill out a personality test, but not according to the way they see themselves. Instead, 20 are randomly assigned to fill it out according to the way they think a parent sees them (i.e. how a parent would fill it out to describe the participant); 20 as their best friend would fill it out for them; and 20 as the professors they know best would fill it out for them. The main results appear in the table below. Explain these results to a person who has not taken a course in statistics
What is the difference between a normal distribution and a standard normal distribution? What is the purpose of using a standard normal distribution instead of the normal distribution?
Would you use a one-tailed or two-tailed test? Explain your response.
A 15-minute Oil and Lube service claims that their average service time is no more than 15 minutes. A random sample of 35 service times was collected, and the sample mean was found to be 16.2 minutes, with a sample standard deviation of 3.5 minute..
How large a sample should be selected in order to estimate the population proportion to within a margin of error of 0.02 with 97% confidence. The sample proportion from the preliminary sample was 0.18.
Determine whether the sentence is statement. Please justify. Write a negation of the inequality.Do not use a slash sign. Answer must be written as an equality.
The life of a calculator manufactured by Intel corporation has a normal distribution with a mean of 50 months and a standard deviation of one year.
She collected the employee performance ratings recorded before and after workshop attendance and stored the paired ratings for all 35 in Perform.
There are k types of distinct postcards. How many ways are there to send these postcards to n friends? (Each friend can get zero cards, also multiple copies of the same card.)
Determine a 95 percent confidence interval for the population mean.
a manufacturer of a certain type of large machine wishes to buy rivets from one of two manufacturers. it is important
The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the inte..
They plan to set up a radar trap and check the speeds of 80 randomly selected cars. Can this distribution be approximated by a normal curve?
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