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A student heard that the average household watches 26.4 hours of t.v. per week, with a stand.dev. of 2.3 hours. He decided to run his own experiment and found that the average for the 58 people he surveyed was 27 hours. a) state H0 and H1 b) calculate the test value c) identify the critical value when a=.01 d) what conclusions can you make?
Probability that if 11 households are selected at random, exactly 9 of the households will own DVD players? Calculate the mean and standard deviation for the problem.
What is the probability that exactly 3 members of the committee are Hispanic? (b) What is the probability that 3 or fewer members of the committee are Hispanic?
If an employee is selected for promotion, find the probability that the employee will be under 25 or a female. Express your answer as a fraction in lowest terms.
What is the sensitivity and specificity of the test? Suppose that 1 out of 500 infants are born with Down's syndrome.
Assume that stock is currently selling for $100. The change in the stock's price throughout the nest year follows a normal random variable with a mean of $10 and a standard deviation of $20.
Neither married nor a college graduate? (answer should be a probability, that is, a number between 0 and 1). Married but not a college graduate? (answer should be a probability, that is, a number between 0 and 1).
Carry out the test for the variance of girls score is not significantly less than the given data.
AU Cellular believes their sales are more consistent than their rival Softbank Cellular. Below is the number lost calls a day over the last seven days. Do you agree with AU? Use the .01 significance level.
A geologist you spoke with is concerned about the rate of land erosion around the base of a dam. Another geologist is studying the magma activity within the earth in an area of New Zealand known for its volcanic activity.
Construct ogive cure and numerical measures for the discrete data.
A university wants to determine the proportion of students who use a cash card to pay at the university food service. Out of 100 students surveyed, 65 students use a cash card. Estimate the value of the population proportion.
Of a random sample of 600 trucks at a bridge, 114 had bad signal lights. Construct a 95 percent confidence interval for the percentage of trucks that had bad signal lights.
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