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A book about college reports that the mean time students study each week is 1015 minutes. A dean says she believes the mean is greater than 1015 minutes. Suppose she takes a random sample of 64 students and finds that the sample mean is 1050 minutes. Assume the population standard deviation is 150 minutes. Test the deans claim at α 0.05 .
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
lets say a publisher makes one typo per 1000 pages. without using the formula or calculating any numerical answers
What is the probability that a batch will be acceptable to the consumer? Is the probability large enough to be an acceptable level of performance?
suppose we draw two tickets from a hat that contains tickets numbered 1234. let x be the 1st number drawn and y be the
explain how the applications of integer programming differ from those of linear programming. why is rounding-down an lp
if z is a standard normal random variable then what is pr-2.61 lt z lt 0.23? use four decimal places of
A popular snack is packed by machine into 9-ounce boxes. The distribution of box weights is normally distributed with a mean of 9 ounces and a variance of 0.01 ounces. What is the probability of randomly selecting a box containing less than 8.9 ou..
Which correlation coefficient Pearson's correlation or spearman rank correlation is the best describe the relationship between the two variables?
The constant-pressure specific of the steam is 0.452 kcal kg-1 K-1. Other data are available in Tables 1.2 and 5.1.
suppose that a car rental agency offers insurance for a week that will cost 10 per day. a minor fender bender will cost
1. one box contains six red balls and four green balls and a second box contains seven red balls and three green balls.
a rancher runs a closed herd of breedin cattle.he keeps and breeds the top 3of bull calves based on individual
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