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Stanford-Binet IQ Test scores are normally distributed with a mean score of 100 and a standard deviation of 16.
(a) Find the probability that a randomly selected person has an IQ test score(1) between 72 and 128.(2) within 1.5 standard deviations of the mean.
(b) Suppose that you take the Stanford-Binet IQ Test and receive a score of 136. What percentage of people would receive a score higher than yours?
In a survey of marketing professionals about various scenarios involving ethical issues, among 205 randomly selected marketing researchers who participated in the survey, 117 said they disapprove of an actions taken in a certain scenario. Suppose that,before the survey was taken, a marketing manager claimed that at least 65 percent of all marketing researchers would disapprove of that scenario.
(a) Assuming that the manager's claim is correct, calculate the probability that 117 or fewer of205 randomly selected marketing researchers would disapprove of the scenario. Use the normal approximation to the binomial.
(b) Based on you result of part (a), do you believe the marketing manager's claim? Explain.
People were polled on how many books they read the previous year. How many subject are needed to estimate the number of books read the previous year within one book with 99% confidence?
A communication network transmits binary digits, 0 to 1, where each digit is transmitted 10 times in succession. During each transmission, there is a 0.995 probability of accurate transmission.
The hypotheses are as follows: Null Hypothesis: μD ≤ 0, Alternative Hypothesis: μD > 0. From her data, the resesarcher calculates a p-value of 0.0162. What is the appropriate conclusion? The difference was calucated as (after - before).
Give a mathematical expression for the probability density function of driving distance.
The following table gives the approximate age distribution in the United States from the 2000 census.
How many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
Would you be willing to provide an example of both methods (step by step) described in your document for determining the forecast based upon the two different methods. Maybe just for one single city.
Show that if in the Law of Large Numbers we omit the assumption that all the X have the same mean and replace the m in the conclusion by [E(X1)+...+E(Xn)]/n, the law remains valid.
Using 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
You are working on an analysis of your company's current cost structure reviewing the various fixed and variable costs within your firm. Your objective is to maximize your firms profit.
Consider a random sample of size n from an exponential distribution, Xi ~ EXP(1,eta). a) Show that Q = X1:n - eta is a pivotal quantity and find its distribution.
Laura wanted to build a multiple regression model based on advertising expenditures and Coffee Time's price index. Based on the selection of all normal values, she obtained the following:
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