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a manufacturer of replacement parts estimates that 90% of the parts are useable. If the manufacturer sells the parts in packages of 10 parts, what are the mean and standard deviation of the numberof useable parts in a package?
the over $50,000 income range did not own a dishwasher. If one household is randomly selected from each income group. Determine the probability that neither household will own a dishwasher.
Does the overall data support the mayor's claim?
We want to know if, at the α = 0.05 level, there is sufficient evidence to conclude that the average calorie content of 1-ounce chocolate chip cookies produced by this brand is greater than 110 calories.
By using significance level a = .05, and suppose a normal distribution what does evidence conclude?
What is the probability that 30% or fewer male employees will indicate that they have to pick up the slack for mom's working flextime ?
Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 19. What is the minimum score needed to be in the top 5% of the scores on the test?
Given the consumer is 18 to 24 years old, what is the probability that the consumer uses a plastic card? Given the consumer is over 24 years old, what is the probability that the consumer uses a plastic card?
Never forget that even small effects can be statistically significant if the samples are large. Of 148 small businesses, 106 were headed by men and 42 were headed by women.
Evette has 41 1/2ft. of string. She wants to cut it into pieces 3 3/4ft. long. How many pieces of string will she have? how much string remains, if any?
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee? How can you tell?
In relative frequency histogram for a large set of GPAs, the mean and the standard deviation are 2.10 and 0.21 respectively. What proportion of GPAs falls within 1.68 and 2.52?
The number of shark attacks and deaths over a recent 5- year period is shown. Find the mean, median, mode, midrange, variance, and standard deviation for the date. Which data set is more valuable?
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