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Assuming that whether or not the students know the answer are independent events, find the variance of the number of students who know the answer.
Which distribution is followed by Xbar? What are its parameters? (if you cannot give the parameter(s), then give point(s) estimate using the appropriate notation) Calculate the interval for 95% conf
Because of nonresponse, the fraction of women among recipients of the survey could be anything between (low) __________ and (high) _________.
Suppose that you must establish regulations concerning the maximum number of people who can occupy an elevator. A study indicates that if eight people occupy the elevator, the probability distributi
Suppose a geyser has a mean time between eruptions of 94 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 24 minutes.
With a mean of 74 and standard deviation of 16. What is the proportion of healthy people will have CBF readings between 60 and 80?
Find the probability that the claim will be rejected assuming that the manufacturer's claim is true. Use the normal distribution to approximate the binomial distribution when possible.
1. The maker of a shampoo knows that customers like this product to have a lot of foam. Ten sample bottles of the product are selected at random and the foam heights observed are as follows (in
Suppose X and Y are continuous random variables with joint pdf f(x, y) = 24xy, 0 < x, 0 < y, and x + y < 1, and zero otherwise.
Find a 95% CI on the mean foam height. Find a 95% prediction interval on the next bottle of shampoo that will be tested.
Suppose the joint pdf of lifetimes of a certain part and a spare is given by
The vehicle dispatching decisions of an airport-based taxi service were investigated. In modeling the system, the authors assumed travel times of successive trips to be independent exponential varia
The height of woman ages 20-29 is normally distributed , with a mean of 63.8 inches. assuming the standard diviation = 2.8 inches. are you more likely to randomly select 1 woman with a height less t
Test the hypothesis that sugar content has a linear relationship with calories. Report and interpret the p-value for the test. Find and interpret a 95% confidence interval for the slope of this regres
A regression equation was fit to a set of data for which the correlation, r, between X and Y was 0.6. Which of the following must be true?i) The slope of the regression line is 0.6.ii) The regressio
A group of 50 randomly selected IUPUI students were asked about registration, and 35 said they were registered. Find a 95% confidence interval for the true proportion of IUPUI students who were regi
A local market research company has been hires to collect data about the salaries of recent college graduates. Based on their research, on average students graduating from business school with a deg
Was your test an upper one-tail, a lower one-tail, or a two-tail? Explain why you chose this kind of test. State the meaning of your P-value in this context.
From the data bank, select a random sample of 30 individuals. a. Use the z test to test the hypothesis for IQ that H0 = 100. Use ? = .05.
A paint manufacturer wants to determine the average drying time of new interior wall paint. If for 15 test areas of equal size he obtained a mean drying time of 66.8 minutes and a standard deviatio
If these figures are true for all Americans drivers, and if 20 such drivers are randomly sampled and asked what is the first big change they made due to higher prices, what is the probability that n
A survey of adults ages 18-29 found that 85% use the internet.You randomly select 118 adults ages 18-29 and ask them if they use the internet.
A company pays its employees an average of $15.90 an hour with a standard deviation of $1.50. If thh wages are normally distributed: What percentage of workers recieve wages between $13.75 and $16.2
Statistics released by the National Highway Safety Administration show that on an average weekend night in urban areas 1 out of every 10 drivers is operating under the influence of alcohol. If 400 d
Suppose the amount of cosmic radiation a person is exposed to when flying across the country is a random variable having a normal distribution with mean of 4.35 mrem and standard deviation of 0.59 m