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Assume a fungus infects the corn crop of a Kansas farmer. The 95% confidence interval turned out to be 37% ± 5%. What is the best way to interpret this confidence interval?
A survey of 2100 people in USA showed that 381 were living below poverty. Hypothesis is to be tested at 2% level of significance that , the proportion of Americans living below poverty level is 0.15
Assume you want to know the proportion of patients who react adversely to new drug and only sample you've has a 22% reaction rate. Which of the following is/are correct?
(a) the critical value for this test (b) the p-value for this test (c) determine the decision about the null hypothesis?
Suppose that the scores of the golfer is normally distributed. Test that the mean score of golfer is 68 at 5% level of significance. Obtain (a) the critical values for this test. (b) Determine the d
Describe the sampling distribution of ˆp , the sample proportion of 18- to 29-yearolds who would prefer to start their own business.
Assume we want to test the claim that the proportion of people age 18-25 in the US who currently use illicit drugs is equal to 20%. Identify the null hypothesis and alternative hypothesis.
Major cracks in a highway follows an exponential distribution with a mean of 5 miles. What is the probability that there are no major cracks in two separate 5-mile stretches of the highway?
For each of the following situations, determine which table should be used for making inferences about the population mean, mu.
Highway transportation officials are trying to find out if the average speed on Archer road is above 45mph, the post speed limit. They took a sample of 50 cars. The sample mean was 44.9 and standard
Assume that a Coke/Pepsi survey was conducted of 400 randomly chosen individuals from Gainesville. 200 people selected Coke. Which of the following statements correctly explains how the confidence i
Automobiles arrive at the vehicle equipment inspection station according to Poisson process with rate = 10 per hour. Assume that with probability 0.5 an arriving vehicle will have no equipment viola
A student is taking a quiz that consists of 4 problems and each problem has 5 possible answers. The student is guessing on all the problems. What is the probability distribution along with the mean?
How many subjects would be needed to determine the true proportion who spend more than $500 on prescription medications per year with margin of error no more than 2%, with 95% confidence?
Assume an observational study is conducted to investigate the smoking behaviors of male as well as female patients with a history of coronary heart disease. Among 220 men surveyed, 80 were smokers.
Suppose we wish to design a study to determine the proportion of patients who received pain therapy following a particular surgical procedure in a local hospital.
Here is the study that looked at beverage consumption, using sample sizes which are relatively smaller. One part of this study compared 20 children who were 7 to 10 years old with the 5 who were 11
Goods costing $ 19.57 at the end of the year 1941 cost $ 207.99 at beginning of the year 1980. Determine the average annual inflation rate over this time period. Express your answer the nearest thou
A city had the population of 1,151 at the begining of 1962 and has been growing at 4.9% per year since then. Determine the size of the city at the end of 1986.
Goods costing $ 19.57 at the end of the year 1941 cost $ 207.99 at the beginning of the year 1980. Find out the average annual inflation rate over this time period. Express your answer the nearest t
A city had a population of 1,151 at the begining of 1962 and has been growing at 4.9% per year since then. Find the size of the city at the end of 1986.
Find out the initial number of bacteria X introduced into the twirly macaroni salad:
A sample of 200 observation selected from population produced sample proportion equal to .91
The two-sided test rejects null hypothesis is at the 2.5% level of confidence since 0 falls outside the confidence interval. Confidence intervals are employed for estimating the population mean, not f
A random sample of 36 mid-sized cars tested for the fuel consumption gave mean of 26.4 miles per gallon with the standard deviation of 2.3 miles per gallon. Determine a 99% confidence interval for p