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1. For a one-way contingency table having four categories, the frequencies corresponding to each category are: 23, 14, 8, 32. Test the hypothesis that each category has the same probability. Use α = .05
2. For a one-way contingency table, the following frequencies are observed: 23, 34, 43, 53, 16. Using α = .01, test the hypothesis that all five categories have the same probability.
Calculate the mean, mx, the variance, sx , and the standard deviation, sx, of the exponential distribution of x. Find the probability that x will be in the interval [mx ± 2sx].
In recent years the irradiation of food to reduce bacteria and preserve the food longer has become more common. A company that performs this service has developed four dierent methods of irradiating food. To determine which is best, it conducts a..
The distribution of scores was approximately bell
The manufacturer of beer kegs claims that 95% of the kegs they produce do not leak after 5 years of use. A bar owner tests the manufacturers claim at the 0.05 significance level. She takes a sample of 200 kegs and finds 185 do not leak. Wha..
Find the z-scores for which 88% of the distributions area lies within -z and z. The z-scores are ?
A furniture cabinet maker produces two types of cabinets that house and hide plasma televisions.
Construct and interpret a 95% confidence interval estimate of the difference in the mean measurements in-lineand from an analytical lab.
What proportion of the 400 salespeople received a bonus last year? What proportion of the 400 salespeople attended the special sales training program at the beginning of last year?
Which result had the margin of error of ±9 percentage points?
Given that the random variable X is normally distributed with a mean of 80 and a standard deviation of 10, P(85
a sample of 60 firms was gathered and 50 stated that they spend more than $50 million per year on safety. test the accountants claim at the 0.05 level of significance
Set up the null and alternative hypotheses needed to attempt to provide evidence supporting the claim that the current audience share for WXYZ is higher than last year's 25 percent share.
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