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A door-to-door sales person for a Household appliance has learned from her past experience that out of twenty demonstrations of her appliance only seven result in actual sales (long run average). This week she needs to make at least four sales. At least how many demonstrations does she need to perform to ensure that the probability of meeting her target is at least 95 percent?
Calculate the 95% confidence maximum error of estimate for a binomial experiment of 1027 trials that result in an observed proportion of .47.
Find the expected number of pairs of people with the same birthday, and the expected number of days in the year on which at least two of these people were born.
1.suppose we have a loaded die which gives the outcomes 1 through 6 according to the probability distributionnbspnote
what proportion of a normal distribution is located in the tail beyond a z-score of z
Calculate a 95% Confidence Interval
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
a. Construct a stem-and-leaf display. b. Comment on the shape of the distribution.
Is there any evidence to suggest that the mean amount of aspartame in an 8-ounce can of diet soda is greater than 65 mg? Use a = 0.01.
Use your calculator to find the mean and standard deviation for the 9 observations that remain when you leave out the outlier. How does the outlier affect the values of x and s? Is s a resistant measure of spread?
A consumer magazine randomly selected 100 new hybrid car dealers from across the country, and created a list of retail prices. They want to know if the price differs from $25,000.
Let the random variable x represent the number that are not correctly calibrated. Find the mean and standard deviation for the random variable x.
Identify the types of descriptive statistics that might be best for summarizing the data, if you were to collect a sample.
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