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In a Gallup poll of 1038 randomly selected adults, 85% said that secondhand smoke is somewhat harmful or very harmful, but a representative of the tobacco industry claims that only 50% of adults be
The weights of domestic, adult cats are normally distributed with a mean of 10.42 pounds and a standard deviation of 0.87 pounds. A cat food manufacturer sells three types of foods for underweight,
The monthly sales of mufflers in the Richmond, Virginia, area follow the normal distribution with a mean of 1,200 and a standard deviation of 225. The manufacturer would like to establish inventory
What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 1,000 is selected (to 4 decimals)?
What is the probability that in any particular cookie being inspected less than five chip parts will be found if the mean number of chip parts per cookie is 6.3
The director of the campus-computing center did a study to determine the patterns of student computer usage. He found that 15% of the total student computer hours occurred during the first 5 weeks o
Suppose you estimated a regression model to predict annual federal tax revenues. Would Suppose you be please if your model yielded an estimated standard error=$3 million. Explain?
How much of the variation in calories can be explained by the number of fat grams per slice?
An import-export firm has a 0.45 chance of concluding a deal to export agricultural equipment to a developing nation if a major competitor does not bid for the contract, and a 0.25 probability of co
The equation of the regression line is y(^on top)=1.06604x+67.3491. Find the coefficient of determination.
A recent survey published in Business Week concludes that Gatorade commands an 83% share of the sports drink market versus 11% for Coca-Cola's PowerAde, 3% for Pepsi's All Sport, and 3% other.
The mean of bowling averages for these men with the new ball is 170. There is no reason to believe the variance is any different with the new ball. Test the null hypothesis that the new ball does no
Suppose water samples from 40 rainfalls are analyzed for pH, and x and s are equal to 3.7 and 0.5, respectively, find a 99% confidence interval for the mean pH in rainfall and interpret the interval
A sample of 50 homes in a subdivision revealed that 24 were ranch style (as opposed to colonial, tri-level, or Cape Cod). (a) Construct a 98 percent confidence interval for the true proportion of ra
Using the .05 significance level, did she keep her promise? (a) Go through the five steps of hypothesis testing. (b) Illustrate your answer with a histogram of the sample's scores and sketches o
What proportion of the first 70 digits in the table are 0s (there are 40 digits in line 101 followed by the first 30 in line 102)? This proportion is an estimate, based on 70 repetitions, of the tr
The mean weight for a certain type of fish is known to be 28.0 ounces with a standard deviation of 2.5 ounces . A game warden catches and weighs 30 fish from a certqin pond to check if they are lar
Find the probability that in 200 tosses of a fair six-sided die, a five will be obtained 30 times. Please provide the detail of how to calculate.
A certain type of tomato seed germinates 90% of the time. A backyard farmer planted 25 seeds.
It is estimated that 3.5% of people will live past 90 years old. Out of 753 people what is the probability that 15 people will live beyond 90?
A study of 80 white mice showed that their average weight was 3.7 ounces. The standard deviation of the population is 0.6 ounces. Which of the following is the 95% confidence interval for the mean
What is the probability a random sample of 75 students will provide a sample mean SAT score within 20 of the population mean?
It is very difficult for small businesses to be successful. The Small Business Administration estimates that 20 percent will dissolve or go bankrupt within two years. A sample of 50 new businesses
A clothing store asserts that 60% of its customers pay by credit. On a particular day, 35 customers purchased items at the store. a. What is the mean and standard deviation of the binomial distribut
A file cabinet manufacturer estimates that 5% of its file cabinets will have drawers that close improperly. Assume a production run of 120 cabinets is completed. a. What is the mean and standard dev