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1. A survey of 120 high school students shows that 39 of them work over 20 hours per week during the school year. Does it demonstrate the conjecture that more than 25% of the high school students work over 20 hours per week during the school year? ( Answer by calculating the P - value.)
2. Each year an insurance company reviews its claim experience in order to set future rates. Regarding their damage-only automobile insurance policies, at least one claim was made on 2073 of the 12,299 policies in effect for the year. Treat these data as a random sample for the population of all possible damage-only policies that could be issued.
A) Calculate the P - value and comment on the strength of evidence.
The company statistician has reported the mean number of man-hours lost per month but did not keep a record of the total sum. Should the manager order the study repeated to obtain the desired information? Explain your answer clearly.
Pollsters just report the results of hypothesis tests that show statistical significance but not those in which there was insufficient evidence.
A car manufacturer tests the first 1,000 cars coming off the assembly line to see if their new anti-lock braking system works correctly. Use the typical values for control limits.
A survey conducted by the American Automobile Association showed that the family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls results in a sample mean of $252...
In a surgey of 280 adults over 50.80%; said they were taking vitamin supplements. Find the margin of error for this survey if we want a 99% confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
Determine whether the evidence is enough to reject the salesperson's claim. Establish the Null and alternative hypothesis, and choose the right test statistics.
They would like the margin of error of the 95% confidence interval for the proportion to be 0.05 or less. Use the guessed value p = 0.25 to find the required sample size.
Find the probability that not enough seats will be available. Is this probability low enough so that overbooking is not a real concern?
Use drinking as an excuse for outrageous behavior. including public nudity and dancing on tables. Find the standard error of this estimate. and interpret.
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
Calculate the sample mean and sample standard deviation.
Assume that you plan to use a significance level of ? = .05 to test the claim that p1 =p2. Use the given sample sizes and numbers of successes to find the pooled estimate p. Round to the nearest thousandth
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