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Calculate the residual standard deviation for predicting a person's IQ score at age 35 from his/her IQ score at age 18. Using this information, roughly 99.7% of all people who had an IQ of 120 at age
Determine a 4-year weighted moving average forecast for 2009, where weights are W1 = 0.1, W2 = 0.2, W3 = 0.2 and W4 = 0.5.
Robert wants to know if there is a relation between money spent on gambling and winnings.
Of three cards, one is painted red on both sides, one is painted black on both sides and one is painted red on one side and black on the other. A card is randomly chosen and placed on a table.
A rental truck agency services its vehicles on a regular basis, routinely checking for mechanical problems. Supose that the agency has six moving vans, two of which need to have new brakes. During a
What are the psychometric properties of The MBTI for bulimia and /or eating disorders?
There are two soda machines at a school. A can soda costs $.75 from Machine A and works 100% of the time. A can of soda from Machine B costs $.50 and this machine works 60% of the time. When B doesn
According to an internet ratings survey, about 59% of the population of the US and Canada had accessed the internet recently. If 4 people from the US or Canada had been selected at random, find the
Suppose that for a certain caribbean island in any 3-year period the probability of a major hurricane is .25, the probability of water damage is .44, and the probability of both a hurricane and wate
A machine has 9 identical components that function independently. The probability that a component will fail is 0.2. The machine will stop working if more than three components fail. Find the probab
Suppose that computer literacy among people 40 and older is being studied and that the following table describes the probability distribution for four randomly selected people, where x is the number
A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. Find P60, the score which separates the lower 60% from the
The Environmental Protection Agency is concerned with the problem of setting criteria for the amounts of certain toxic chemicals to be allowed in freshwater lakes and rivers.
There are 1000 such numbers. A bet of $10 is placed on a number. If the number is selected, the player wins $1,000. If any other number is selected, the player wins nothing. Find the expected value
What is the measure of the strength of the relationship between independent and dependent variables.
Consider a sample with data values of 10, 20, 12, 17, and 16. Compute the z-score for each of the five observations (to 2 decimals).
The difference between the forecast and actual demand is called forecast mistake. Is this true or false and why?
Assume that the probability distribution of the lifetimes of the participants is approxately a normal distribution with a mean of 68 years and a standard deviation of 4 years.
An IRS inspector randomly selects five persons from a group of 20 who are potential candidates to be audited. Of the 20 persons, nine were audited in the past, while the other 11 have never been aud
Consider the formula used for confidence interval and the elements included in the formula. What happens to the confidence interval if cthe confidence level is increased, if the sample size is incre
What is the probability that both Babe and Benji consumed the same number of cherries with seeds? Given that Benji consumed exactly two cherries with seeds, what is the probability that Babe consumed
In a random survey of drivers, 61 out of 90 males drivers considered themselves aggressive at the wheel. A similar survey of women drivers resulted in 31 out of 106 describing themselves as aggresiv
The answers in a. and b. are really the probabilities that you will make errors. Rejecting good batches and accepting bad batches are errors. How could you change your sampling plan to reduce these
The Department of commerce in a particular state has determined that the number of small businesses that declare bankruptcy per month has a discrete probability distribution, with a mean equal to 6.