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A 20% of the 745 respondents reported that bullying occurred in their department. Using these respondents as the sample, give a 95% CI for the total number of nurses in the county who would report
Employment data at a large company reveal that 68% of the workers are married ( event A ) and that 52% of the workers are college graduates ( event B). It is also known that 21% of the workers are c
In a statistical test of hypotheses, we reject the null hypothesis at alpha if:
Thirty eight percent of young adults say they use credit cards because of the rewards program. Seven young adults are selected at random.
In the sample of seven young adults, what is the probability that all of the adults use credit cards because of the rewards program?
The article "High Levels of Mercury Are Found in Californians" describes a study in which hair samples were tested for mercury. The hair samples were obtained from more than 6000 people who voluntar
Suppose that a group of 1000 orange trees is laid out in 50 rows of 20 trees each. To determine the sugar content of fruit from a sample of 30 trees, researcher
A survey of affluent Americans (those with incomes of $75,000 or more) indicated that 56% would rather have more time than more money.
1. A company is interested in estimating the mean amount of money employees spend on lunch in their cafeteria. From a previous study we know that the population standard deviation is calculated to b
In an investigation of environmental causes of disease, data were collected on the annual mortality rate ( deaths per 100,000) for males in 61 large towns in England. In addition, water hardness was
A local cable TV company, with customers in 15 towns is considering offering high-speed Internet service on its cable lines. Before launching the new service they want to find out whether customers
Test the hypothesis using the classical approach and the P-value approach.
state the appropriate null and alternative hypotheses; Ho= , Ha= calculate the test statistic. c) calculate the corresponding p-value ( or range for the p-value)
Determine the null and alternative hypotheses, (b), explain what it would mean to make a type I error and (c) explain what it would mean to make a type II error.
Determine the point estimate of the population, the margin of error for the following confidence interval, and the number of individuals in the sample with the specified characteristic, x, for the s
Find the sample proportion of people who had the Internet on their home computers. Find the 99% confidence interval for the population proportion of people who had the Internet on their home computers
At a Psychology final exam, the scores are normally distributed with a mean 73 points and a standard deviation of 10.6 points. The lower 5% of the class will not get a passing grade. Find the score
A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conc
The value for za/2 that will be used to calculate the 99% condidence interval is? Estimate the mean of return on all real estate investments with 99% confidence.
Independent probability based on two unrelated outcomes. Classical probability based on the ratio of the number of ways the event can occur. Relative frequency based on previous history
The Newton-Pepys problem: Assume the following problem only involves fair, six-sided dice. (a) Calculate the probability that, when rolling six dice, at least one "6" is rolled.
In a survey, respondents were asked to indicate their favorite brand of cereal (Post or Kellogg's). They were allowed only one choice. What is the probability concept that implies it is not possible
They have a steak dinner bet on next year's race, with Pat betting on the Red Sox and Tom on the Yankees. Both are convinced they will win. What probability assessment technique is being used by the
Micron Technology has sales offices located in four cities: Dallas, Seattle, Boston, and Los Angeles. An analysis of the company's accounts receivables reveals the number of overdue invoices by days
Find and attach a cross tabulation of data that is of interest to you. Write a question for the following along with the answer using your data: