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Find the Sample Size
a. A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.15? A previous study showed that the standard deviation of the price was $0.26.
b. A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 4% of the true proportion. Find the sample necessary if, in a prior study, a sample of 200 people showed that 40 traveled overseas last year. If no estimate of the sample proportion is available, how large should the sample be?
Using the 0.05 level of significance, evaluate the effectiveness of the program. Using the appropriate statistical table, what is the most accurate statement we can make about the p-value for this test?
translate the following statements into equivilant formal expressionsa. some things are not owned by anyone.b. some
IQ scores in the population have a mean of 100 and a standard deviation of 15. If Bob has an IQ of 83, what percent of people have scores lower than him? If Sally has an IQ of 97, what percent of people have scores higher than her?
use the definition of random selection of points in an interval in section 1.7 a bus arrives at a station everyday at a
Calculating Loan Payments. You want to buy a new sports coupe for $73,400, and the finance office at the dealership has quoted you a loan with an APR of 5.1.
Find the probability that the dentist will see the patient between 10 and 20 minutes after the appointment time
He concludes that the new treatment, with a P-value of 0.047, is more effective. Explain what the P-value means in this context.
an airline wants to estimate the average number of unoccupied seats per flight. a random sample of 105 flights is
Suppose the experiment is now a randomized block experiment with three blocks. There are five whole plot experimental units for factor A in each of the three blocks. a. Explain a method of randomizing the experimental units to the levels of factors..
which of the following statements is a good definition of instrument validity?a it is the accurate measurement of a
Look at the most recent Statistical Abstract of the United States (www.census.gov/compendia/statab/) and make a two-way table that provides the counts of deaths due to accidents from various causes for three different age groups. What do you concl..
Given that Vacationer will travel less than 500 miles, Find out the probability that he/she will drive or take the Bus/Train?
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