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Suppose that at Elkhorn High School, the number of hours per week that seniors spend on homework is approximately Normally distributed with a mean of 18.6 and a standard deviation of 6.0. Mrs. Habrock selects many simple random samples of 36 seniors and calculates the sample mean number of hours spent on homework per week for each sample. Which of the following should be closest to the mean of the approximate sampling distribution?
a. 1.0
b. 3.1
c. 6.0
d. 18.6
e. This value cannot be determined without the actual data.
Community college spends each year. If she wishes to be 90% confident, how large a sample is necessary if the standard deviation is known to be $80?
What's the probability that a randomly selected Ayrshire gives more milk than a randomly selected Jersey?- A farmer has 20 Jerseys. What's the probability that the average production for this small herd exceeds 45 pounds of milk a day?
the cost of a one-carat vs2 clarity h color diamond from diamond source usa is 5600 diamond source website march 2003.
With the new capacity that will be added in the 4th quarter, how would you categorize the paper mask forecast for the first and second quarter?
Among 500 freshmen pursuing a business degree at a university, 347 are enrolled in an economics course, 247 are enrolled in a mathematics course, and 120 are enrolled in both an economics and a mathematics course. What is the probability that a..
(a) Fit a multiple linear regression model to predict MPG (miles per gallon) from the other variables. Summarize your analysis. (b) Use Mallow Cp to select a best sub-model. To search through the models try (i) forward stepwise, (ii) backward..
Let X1, ..., Xn be i.i.d. from N(µ, s2) with unknown µ and s2. Consider the problem of testing H0; µ = 0 versus H1; µ ? 0 and the group of transformations
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
According to an? airline, flights on a certain route are on time 80% of the time. Suppose 13 flights are randomly selected and the number of?flights is recorded
STA30305-Summarize the customers’ profile by account balance, number of cash deposit made via the ATM and whether the customer receives interest on the account.
What is the probability that between 2,500 and 4,200 acres will be burned in any given year?
find the following z-scores for the standard normal distribution. round to three decimal places.1. z0.152.
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