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Determine the mean of the sampling distribution of the sample proportion?
If np is greater than or equal to 15 and n(1-p) is greater than or equal to 15, what is the approximate shape of the sampling distribution of the sample proportion?
Assume that number of accidents at the power plant follows the Poisson process with the average rate of 0.40 accidents per week. Assume all weeks are independent of each other
Find out a 98% confidence interval for proportion of internet users who have employed a wireless device. If only the success/failure condition isn't satisfied, then instead construct adjusted 98% con
It is believed that as many as 20% of adults over 50 never graduated high school. We wish to see if this percentage is same among the 25-30 age group.
In a survey regarding downloading music, a survey asked 733 internet users if they "ever downloaded music from the internet site that was not authorized by the record company or not" and 25% respond
A raffle has a grand prize of a European cruise valued at $13000 with a second prize of a weekend in San Diego valued at $600. If each ticket costs $5 and 10400 tickets are sold, what are the expect
Assume we want to cut the margin of error to 3%. What is the neccessary sample size?
Local television has quite the interest in who is watching and other statistic is raw numbers of viewers. See below some numbers of viewers for the three major stations and using equal expected freq
A friend of mine has the clothing store and sells various lines of shoes. Tell me at the 0.05 level of significance if there is any preference among the lines by customers. If there is the preferenc
Ravencheck Resources, Inc. is a brokerage of ten salespeople. A productivity survey of the firm's employees indicated the following data:
Suggest the average available for all hotel rooms. Determine the point estimate of the average number of available hotel rooms in this lesson from each sample. Make and Interpret a 95% confidence le
A small company involved in the e-commerce is intersted in statistics concerning the employ of e-mail. A poll found that 35% of random sample of 1188 adults, who employ a computer at their home, wor
A carton contains 12 eggs, 3 of which are cracked. If we randomly select 5 of the eggs for hard boiling, what is the probability of the following events?
Write out the regression equation, discuss each of the variables; how many wins does playing on natural grass for a home field add to or subtract from the total wins for the season.
The cholesteral levels of a sample of 42 healthy adults is taken. What is the probability that the mean cholesteral level of the sample will be greater than 200?
According to a poll the cholesteral level in healthy adult citizens of a major city average about 215mg/dL with a standard deviation of 40mg/dL and are roughly normal distributed.The cholesteral lev
Assuming that the population is normally distributed, construct a 95% confidence interval estimate for the population mean for each of the following samples:
If you multiply a random variable by 10, then the mean is multiplied by 10 and the variance is multiplied by 10. When finding the mean of the sum of two random variables, you need to know the correlat
What is the probability that she will remember seeing the ad? If an adultwoman remembers seeing the ad, what is the probability that she watched the program on network C?
For simplicity assume that viewers of these programs are sure to see advertisements if they are watching a program. If Chips ‘n' Fish Restaurants advertise only on network during the sports pr
A package of twelve Ping-Pong balls contains two defectives. An inspection procedure to check on the quality of the package is to select randomly two Ping-Pong balls for inspection and to reject the
The Sacred Grounds coffee shop in the Deadhorse, AK, is considering replacing its coffee brewing units with the new German brewers. You have been assigned to examine this proposal. Make a 99% confid
Data were recorded for the six industrial plants. Plant no. 1 2 3 4 5 6 Before program 38 64 42 70 58 30 After program 31 58 43 65 52 29 Do the data provide sufficient evidence to point out whether