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The P-value for a one-mean t-test is estimated using a t-table as 0.05 < P < 0.10. Based on this information, for what sigificance levels can the null hypothesis be rejected?
If all cars in the usa ran with petrol blended with 20% bioethanol produced by enzymatic hydrolysis of cellulosic feedstock, what would be the annual reduction in co2 production in tonnes?
When conducting a hypothesis test with chi-square analysis, the null hypothesis is rejected when the differences between the expected and observed frequencies are relatively large.
A sample of 850 people resulted in a confidence interval estimate for the proportion of people who believe that the Fed. Gov.'s proposed tex increse is justified is between .14 and .20. Based on thi
After the recalibration, the quality-control manager randomly selects 19 bottles from the line and determines that the standard deviation is 0.38 ounce. Is there less variability in the filling mach
Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.)
A fair coin is tossed 500 times. Find the probability of obtaining more than 300 heads.
A multiple-choice test consists of 77 questions with possible answers of a, b, c, d, e. Estimate the probability that with random quessing, the number of correct answers is at least 33.
Use normal approximation to estimate the probability of getting more than 49 girls in 100 births. Assume that boys and girls are equally likely.
In a clinical trial of a drug used to help subjects stop smoking, 812 subjects were treated with 1 mg doses of the drug. That group consisted of 49 subjects who experienced nausea. The probability o
A fair coin is tossed 20 times and x=6 heads are observed. Let p=P(head). A test of Ho:p=.5 versus Ha: p<.05 is to be performed based upon the results of the 20 tosses. What is the p-value for th
In a past election, the voter turnout was 51%. In a survey, 843 subjects were asked if they voted in the election. Find the mean and standard deviation fot the numbers of voters in groups of 843.
If an exercise scientist wants to estimate the proportion of American adults who exercise for 30 minutes three or more times per week. He wants to construct a 90% confidence interval with a margin o
The AlphaCor Company experiences some type of failure on its computer network on average once every 4 hours. Assume that each failure is independent of all other failures and no two failures occur
Assume that the times between the birthday messages are independent. a) What is the probability the next posting takes 15 minutes or longer to appear?
What is the expected return of this asset? Enter answer in percents, accurate to two decimal places.
You want to make an average rate of return of 8.2% on your money. An acquaintance approaches you for a one-year loan. You think he's a pretty decent fellow, but estimate that there's a 1.9 % chance
Find the mean and standard deviation for the number of times this letter will be found on a typical page of 3300 characters.
The time, T, between emissions radioactive emissions has an eponential distribution with a mean of 4 seconds between emissions.
Find the mean and the standard deviation for the number of correct answers for such students. Would it be unusual for a student to pass by guessing a getting at least 5 correct answers?
Suppose z is standard normal random variable. Calculate the following possibilities.
The Rayleigh probability density function is a single parameter probability density function and is important as a model for wind speed, and for example is used in estimating energy recovery from a
Use the fact that the standard normal distribution integrates to 1 to evaluate the following integral. I.e., use:
Golfweek reported in 2003 that the driving distance for the top 100 golfers on the PGA tour is between 287.7 and 310.6 yards. Assume that the driving distance is uniformly distributed over this inte