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The mean temp in LA is 66.3 degrees F with a standard deviation of 8 degrees F. The temp readings are normally distributed. What is the probability the temp in LA is less than 78.22 F any given day.
Determine the mean and the standard deviation of the sample.
Conduct a hypothesis test of to see whether the 2001 sample data indicate that the variability in interest rates has changed. Use . What is your conclusion?
If a six appears for the second time, the process is repeated with the move depending on the number shown and the previous throws. If a six appears for the third time, the turn of the player ends without moving the token.
hese students obtained a mean score of 470 with a standard deviation of 40 on a standardized test. Assuming a mound-shaped and symmetric distribution, what percentage of scores exceeded 390?
Assume that x has a normal distribution, with the specified mean and standard deviation. Find the indicated probabilities.
A manufacturer of executive jet aircraft is concerned with its profit picture over the short run. It produces two different models of planes, x1 and x2. Its profits are $30,000 for each x1 and $20,000 for each x2. There are two major constraints o..
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p -value.
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2 eggs per month.
Fast Service, a chain of automotive tune-up shops, advertises that its personnel can change the oil, replace the oil filter, and lubricate any standard automobile in 15 minutes, on the average.
A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40.0 hours. You believe this figure is too large and decide to conduct your own test.
A consumer watchdog organization wants to see whether Bank N in the northern part of a state has a higher default rate than Bank S in the southern part of that same state.
The quality control manager at a lightbulb factory needs to determine whether the mean life of a large shipment of lightbulbs is equal to the specified value of 375 hours.
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