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The heights of all adults in Canada are normally distributed with a mean of 67 inches and a population standard deviation of 4 inches. For any one person selected at random, what is the probability that their height will be:
a) more than 69 inches?b) between 64.5 and 69.3 inches?c) less than 56 inches?
This is my own made up problem. I just want to learn which test would I use t,z, or Chi and HOW do I go about doing it.
Banner Mattress and Furniture Company wishes to study the number of credit applications received per day for the last 300 days.
Use this information to find the upper and lower limits of the first class if you wish to construct a frequency distribution with 10 classes.
Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee.
If the probability of no accidents during a 24 hour period is 0.1353, what is the mean number of accidents per 24 hour period?
What is the probability that the first order will come on the fourth sales call of the day? Please show work and round to 4 decimal places.
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.
Use the analysis of variance (α = 0.05) to find out whether this data is sufficient to conclude that there are significant differences between feedback conditions.
For what proportion of patients will drug be effective for between 2 and 2.25 hours?
a bank has the following data on the gender and marital status of 200 customers: single 20 male 30 female, married male 100 female 50,
Does Lavastatin reduce the risk of heart attack? In a Texas Study, researchers gave Lovastatin to 2,325 people, and a inactive substitute to 2,081 people, with an average age of 58. After 5 years, 57 of the lovastatin group suffered a heart attack..
A large population of overdue bills has balances that fallow a normal curve. When we take a sample of 100 of these the average is $500 and the standard deviation is $100.
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