In a large population of adults, the mean IQ is 112 with a standard deviation of 20. Suppose 200 adults are randomly selected for a market research campaign. The probability that the sample mean IQ is greater than 110 is...?
In a large population of adults, the mean IQ is 112 with a standard deviation of 20
In a large population of adults, the mean IQ is 112 with a standard deviation of 20. Suppose 200 adults are randomly selected for a market research campaign. The sampling distribution of the sample mean IQ is a. approximately Normal, mean 112, standard deviation 20. ob approximately Normal, mean 112, standard deviation 1.414. approximately Normal, mean 112, standard deviation 0.1. d. exactly Normal, mean 112, standard deviation 20.
In a large population of adults, the mean IQ and standard deviation are respectively. Suppose 200 adults are randomly selected for a market research campaign. What is the probability that the sample mean is less than 110?
The standard IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of all adults. We wish to find the sample size necessary to estimate the mean IQ score of statistics students. Suppose we want to be 96% confident that our sample mean is within 1 IQ points of the true mean. The mean for this population is clearly greater than 100 . The standard deviation for this population is probably...
In a large population of prisoners, the mean IQ is 95 with a standard deviation of 15. 250 adults from this population are randomly selected for a survey of attitudes toward crime. a. What is the mean of this sampling distribution (all samples of n = 250)? b. What is the standard deviation of the sampling distribution? c. What is the shape of sampling distribution? d. If an individual prisoner has an IQ of 90, is she a likely or...
assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 20. find the probability that a randomly selected adult has an IQ less than 20.
A typical adult has an average IQ score of 105 with a standard deviation of 20. If 20 randomly selected adults are given an IQ test, what is the probability that the sample mean scores will between 102 and 110 points? (Round to 2 decimal places)
A typical adult has an average IQ score of 105 with a standard deviation of 20. M 20 randomly selected adults are given an IQ test, what is the probability that the sample mean scores will between 102 and 110 points? (Round to 2 decimal places)
Assume that adults have IQ scores that are normally distributed with a mean of 95.7 and a standard deviation of 18.4.Find the probability that a randomly selected adult has an IQ greater than 127.2. The probability that a randomly selected adult from this group has an IQ greater than 127.2 __
The IQ scores of adults are normally distributed with a mean 100 and a standard deviation of 15. If a group of 64 adults is randomly selected, what is the probability that their mean IQ will be at least 95? A. 0.6293 B. 0.3707 C. 0.9962 D. 0.0038
Assume that adults have IQ scores that are normally distributed with a mean of 95.5 and a standard deviation of 19.5. Find the probability that a randomly selected adult has an IQ greater than 122.0. (Hint: Draw a graph.) The probability that a randomly selected adult from this group has an IQ greater than 122.0 is....