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Adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. A competitive school requires an applicant to have an IQ score in the top 10% of adults. What is the cutoff score?
The owner of a restaurant has just changed the delivery process in order to reduce the mean time between the order and completion of delivery from the current 25 minutes.
Use this as the population mean and the population standard deviation is $.20. What is the probability that the mean price for a sample of 30 service station will be within $.03.
64% of men consider themselves professional baseball fans. You randomly select 10 men and ask each if he considers himself a professional baseball fan.
Jim and Mike go to a coffee shop during their lunch break and toss a coin to see who will pay. The probability that Mike will pay three days in a row is 0.125.
Why is estimating a multiple regression model just as easy as bivariate regression?
A consumer agency has retained an independet testing firm to examine a television manufacturer's claim that its 25-inch console lmodel consumes just 110 watts of electricity.
Illustrate how you could use the interrupted time series design to naswer a real world research question through the use of archival data.
If two televisions are randomly selected, compute the probability that both televisions work. What is the probability at least one does not work?
What is the probability that none of three randomly selected persons is allergic to this drug? Assume that all three persons are independent.
A candy bar manufacturer is interested in trying to estimate how sales are influenced by the price of their product. To do this, the company randomly chooses 6 small cities and offers the candy bar at different prices.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
36 values given here are based on summary statistics from research by cumming. Do you think that these data are normally distributed?
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