Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509 and a standard deviation of 108. A random sample of 36 men is selected.

# Category Archives: / Statistics

## To plan for the Betropolis High School Faculty Picnic a group consisting of two

To plan for the Betropolis High School Faculty Picnic a group consisting of two women and two men will be formed. If there are 10 women, 7 men who have volunteered then in how many different ways can the group be formed?

## A study is designed to find the mean weight of a fish caught by a fishing compan

A study is designed to find the mean weight of a fish caught by a fishing company. Find the minimum sample size needed in order to construct a 95% confidence interval for the mean weight of such salmon, to within 0.20 pounds. Assume that the standard deviation=2.10

## Polls showed the two main candidates in the 2004 presidential election were near

Polls showed the two main candidates in the 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has a margin of error of less than 1%. Roughly how large a sample would be needed for such a poll?

## If x is a binomial random variable, calculate μ ,σ2 ,and σ for each of the follo

If x is a binomial random variable, calculate μ ,σ2 ,and σ for each of the following values of n and p. Complete parts a through f.a. n=25 ,p=0.5

## (a) Use Excel to sketch a graph of the standard normal distribution with a mean

(a) Use Excel to sketch a graph of the standard normal distribution with a mean of 0 and a standard deviation of 1. Generate x values in column A ranging from -3 to 3 in increments of 0.5. Use NORM.DIST to generate the y values in column B. (b) Use Excel to sketch a graph […]

## Managers at an automobile manufacturing plant would like to estimate the mean co

Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation, m. The managers plan to choose a random sample of completion times and estimate m via the sample. Assuming that the standard deviation of the population of completion times is 10.1 minutes, what is the minimum […]

## 7. The expected frequency of a category is given by Ε = np where n is the sample

7. The expected frequency of a category is given by Ε = np where n is the sample size and p is the probability that an element belongs to that category if the null hypothesis is true. The ________ for a goodness–of–fit test are k – 1, where k denotes the number of possible outcomes (or […]

## The media selection manager for an advertising agency inserts the same advertise

The media selection manager for an advertising agency inserts the same advertisement for a client bank in two magazines, similarly placed in each. One month later, a market research study finds that 226 of 473 readers of the first magazine are aware of the banking services offered in the ad, as are 165 of 439 […]

## In developing patient appointment schedules, a medical center desires an estimat

In developing patient appointment schedules, a medical center desires an estimate of the mean time that a staff member spends with each patient. How large a sample should be taken if the precision of the estimate is to be +/- 3 minutes at an 85% level of confidence? Use a planning value for the population […]