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Determine the mean, variance and standard deviation of Y in terms of the mean and variance of X (with E[X] = 5 and var(X) = 9), where Y = X - E[X].
Find the critical value to test the claim that all ages have crash rates proportional to their driving rates. That all ages have crash rates proportional to their driving rates.
What is the (a) Minimum number of doctors required so that at least 70% of the arriving patients can receive treatment immediately
The standard deviation is estimated to be 0.279. Use the 99% level of confidence.
Which option produces the smallest risk of a Type I error?
A coin is tossed 100 times. The difference "number of heads - number of tails" is like the sum of 100 draws from one of the following boxes. which one, and why?
WonderDrug Company wants to test the effectiveness of a new headache drug. What sampling technique (simple random, stratified random, cluster, convenience) is WonderDrug Company using in each of the following studies?
Suppose the score of architects on a partecular creativity test are normally distributed. What percetage of architects have a Z scores (A) above .10.
A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
A survey found that 85% of women in a given city enjoy shopping online. Suppose you randomly selected 6 women from the city and ask them whether or not they enjoy shopping online. Find the probability that exactly 4 say they enjoy shopping online.
The most important material reclaimed from beverage bottles is PET plastic. A serious impurity is aluminum, which later can clog the filters in extruders when the recycled material is used.
Conduct a hypothesis test for each sample at the 0.01 level of significance and determine what action, if any should be taken.
A sample of 19 albino Hungarian banded aardvarks was examined for nose length. Since this is a small sample, how various degrees of freedom will be used to find the t-score.
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