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According to the 1996 Statistical Abstract of the United States, 7.6% of the scores on the verbal portion of the Scholastic Aptitude Test (SAT) exceeded 600. Approximately, 42.3% of the cores were less than 400, according to the same reference. Assuming that scores on the verbal portion of the Scholastic Aptitude Test are approximately normally distributed, what are the mean and the standard deviation of the scores on the verbal portion of the Scholastic Aptitude Test?
Using given data table, find out midpoint for class with greatest frequency?
Which of the following is the appropriate conclusion from carrying out these multiple comparisons
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
Do the data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
If, on the average, 20 orders are received by fax every two hours throughout the day, find the a. probability that a faxed order will arrive within the next 9 minutes.
Describe your answer to a person who has never had a course in statistics.
What is the probability that a random person has an IQ between 85 and 115? Find the 90th percentile of the IQ distribution.
The mean of a normal distribution probability is 400 pounds. The standard deviation is 10. What is the area between 415 pounds and the mean of 400 pounds? (Round to 4 decimals)
Assume that the weights of coconuts are normally distributed with a mean weight of 17.6 pounds and a standard deviation of 1.2 pounds.
Perform a hypothesis test with significance level 5%. Show all work, and clearly state your conclusion.
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
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