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The IQ scores are normally distributed with a mean of 100 and a standard deviation of 15.
1. What is the probability that a random person has an IQ between 85 and 115?
2. Find the 90th percentile of the IQ distribution.
3. If a random sample of 100 people is selected, what is the standard deviation of the sample mean?
How much do typical employee and his or her family spends per year on dental expenses? Sample of 45 employee reveals mean amount spend last year was $1,820, with standard deviation of $ 660.
I survey 50 potential consumers regarding their interest in the product, 34 express an interest in purchasing it. The maximum price each would be willing to pay is shown below.
What are the null and alternative hypotheses in this situation?
The standard deviation is estimated to be 0.279. Use the 99% level of confidence.
Supposing that there is no cost of entering the sweepstakes, find the expected value of the amount won for one entry. Determine the expected value if the cost of entering this sweepstakes is the cost of a postage stamp. Is it worth entering the cont..
The probability that average amount of purchase per weekend from Sam's sample is greater than average amount of purchase per weekend from Katie's sample =
Formulate the null and alternative hypotheses for this application.
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
Define the Linear programming problem (LPP)
The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
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