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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.
A shipment of 10 items has two defective and eight nondefective items. In the inspection of the shipment, a sample of items will be selected and tested. if a defective item is found the shipment of 10 will be rejected.
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribution of the battery lives closely follows the normal probability distribtion with a standard deviat..
The data show the total number of medals (gold, silver, and bronze) won by each country winning at least one gold medal in the 2006 Winter Olympics. Find the mean, median, and mode of the numbers of medals won by these countries.
Consider a binomial distribution with 15 identical trials, and a probability of success of 0.5. Use the normal approximation to find the probability that x = 2.
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
In a certain town, 60% of adults have a college degree. The accompanying table describes the probability distribution for the number of adults
The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is normally distributed with a mean of 600 and a standard deviation of 100.
Sales manager wishes to award sales representatives who earn the largest commissions a bonus of= $1,000 .He can award bonus to 20% of representatives. Determine cutoff point between those who earn bonus and those who don't?
A population is normally distributed, with a mean of 23.45 and a standard deviation of 3.8. What is the probability of each of the following?
The average gasoline price of one of the major oil companies in Europe has been $1.25 per liter. Recently, the company has undertaken several efficiency measures in order to reduce prices.
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
Which conditional distributions do these statistics refer to, those of y at given catagories of x, or those of x at given categories of y? Set up a table with race of murderers as rows and race of victims as columns, showing the two conditional di..
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