Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
In a sample of 1000 bartenders, 48% heard complaints from patrons about work. If the margin of error was 6.5%, what was the confidence level that was used?
If the standard deviation of the lifetimes of vacuum cleaners is estimated to be 300 hours, how large of a sample must be taken in order to be 97% confident that the margin of error will not exceed
The 27 awards are (in $1000s) given below. What is the maximum possible amount that could be awarded under the two-standard-deviation rule?
A researcher is interested in determining the average number of years employees of a company stay with the company. If past information shows a standard deviation of 7 months, what size sample shoul
When using the formula NI = [U * (P-VCu)] - FC, in which order must you complete the calculation? Why does the order of operations matter? What is an independent variable? What is a dependent? What
In a random sample of 500 college students, 23% say that they read or watch the news every day. Develop a 90% confidence interval for the population proportion.
A production facility employs 20 workers on the day shift. What is the probability that at least one of the shifts will be unrepresented in that sample of workers?
Six hundred consumers were asked whether they would like to purchase a domestic or a foreign automobile. Their responses are given below.
The median age of residents of the united states is 31years. if a survey of 100 randomly selected united states residents is to be taken, what is the approximate probability that at least 60 will be
A university planner wants to determine the proportion of spring semester students who will attend summer school. She surveys 32 current students discovering that 12 will return for summer school. W
In one region, the mean number of dandelions per square meter was found to be 8.0. Use the Poison distribution to find the indicated probabilites. Find the probability of 6 dandelions in an area of
How large of sample should be taken this year to estimate the percentage of members who use the treadmill at least 4 times a week? The estimate is desired to have a margin of error of 5% with a 95%
Formulate a spreadsheet model for performing a computer simulation of the daily sales. Perform 250 replications and obtain the average of the sales over the replications.
Members of the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students produced the results given in the table
A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business din
A random variable is normally distributed with a mean of 25 and a standard deviation of 5. if an observation is randomly selected a distribution, what value will be exceeded 10% of the time?
The roads in Winnipeg during rush hour are occupied by just the driver. If you choose 12 vehicles at random, what is the probability that 7 or more carry just the driver?
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 conclude, at the .10 level
How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 99% confidence?
Conde Nast Traveler publishes a Gold List of the top hotels all over the world. What is the probability all the hotel's rooms will be rented (to 4 decimals)?
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness fo
Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls (to 2 decimals).
Why is using Bayes' theorem important to help answer business-related questions? What does this theorem allow you to do that traditional statistics do not? What are some prerequisites for using Baye
A manufacturing process has a 77% yield, meaning that 77% of the products are acceptable and 23% are defective. If three of the products are randomly selected, find the probability that all of them
Which of the following is true regarding the two smoothing constants of the Forecast Including Trend (FIT) model (which is also called exponential smoothing with trend adjustment)?