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Suppose that you used a 9-point rating scale and that you wanted to compare men who had an annual income over $50,000 (Group 1) with men who had an annual income less than or equal to $50,000 (Group 2) on their liking of a new product. If you studied 40 men in Group 1 and they have a mean of 7 and a standard deviation of 2.5, while the 35 men in Group 2 have a mean of 5 and a standard deviation of 1.4, what is the approximate value of t using the t-test?
to find the sample size needed for a hypothesis test if ho mu10 ha mult10 sigma is unknown alpha 0.01 beta 0.05 and e
Compute the probability of receiving four calls in a five-minute interval of time. Compute the probability of receiving more than 10 calls in a five-minute interval of time.
every hour 10000 cans of soda are filled by a machine among which 300 underfilled cans are produced. each hour a
raisel is the new statistician at a cola company. she wants to estimate the proportion of the population who enjoy
a research study has stated that the taxes paid by individuals is correlated at a .78 value with the age of the
Student team examined parked cars in 4 different suburban shopping malls. One hundred vehicles were studied in each location. Research question : At α = . 05.
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
find the margin of error for the 95 confidence interval used to estimate the population proportion.in a survey of 7100
let x have a nonstandard normal distribution with mu46 and sigma9 find the unknown boundary a such that p44ltxlta
Exponential distribution with a mean of 4 minutes. What is the probability that a person is served in less than 3 minutes on at least 4 of the next 6 days?
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
consider a normal distribution curve where 90-th percentile is at 13 and the 15-th percentile is at 7. use this
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