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Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence
Find the probability that the surgury is successful for fewer than six patients
As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kernels were counted. There were 86. a)Construct a 9
A robot, when working properly, produces 5% or less defective items. whenever the robot produces more than 5% defective items, needs repair.
A bank has determined that the monthly balances of savings accounts of its customers are normaly distributed with an average balance of $1200 and standard deviation of $250.
What is the probability that he or she will be a problem gambler who does not play poker machines (rounded to 3 decimal places)?
What are the 5 steps involved in hypothesis testing using the traditional/classical method; Can you use a simple real world example to explain it.
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
Randomly chosen circulated nickels were weighed by statistics student Dorothy Duffy as an independent project. Nickels were weighed on a Mettler PE 360 Delta Range scale, accurate to 0.001 gram. The c
What is the probability that he or she is a Coalition voter (rounded to 3 decimal places)?
Marge and Joe have five daughters. They decide to have another baby because they are sure the next one will be a boy (after all, what are the odds of having another girl!)
Based on information obtained from a sample of 54, a 98% confidence interval for the average profit level of regional banks is given by 67.4 million to 87.78 million. Determine the sample standard dev
A woman wrote to DearAbby and claimed that she gave birth 308 days after a visit from her husband, who is in the Navy. Lengths of pregnancies have a mean of 268 days and a standard deviation of 15 day
What is the standard general score conversion formula? Is this the same as a z-score formula? Which leads me to ask How do you convert from one standard score to another?
Find the probabilities for the following discrete random variables and find the probability that the salad contains more than 5 vegetables on i) a given day and on ii)3 of the next 4 days?
When you calculate CIs for time on task, I notice that you use the critical value from the t-distribution (TINV(0.05, degrees_of_freedom))
What is the formula for the exclusive range?
What is the Variance, Standard Deviation and Range of the following set of scores? 20,24,26,22,18,16,18 and then 10,15,12,18,19,16,12
An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving the factory. She measures the tire pressure on a sample of 10 randomly selected cars as they are about
How do you find the normal distribution when the mean is 50 witha standard deviation between scores of 32 and 47?
What is the probability that the male sample will have at most three more days of absences than the female sample?
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the flee
Calculating the effectiveness of an educational intervention using a pretest-posttest design. I plan to run an ANCOVA on the scores with the pretest as the covariate. The six subcatagories on the test
Test at the 5% level of significance whether the true mean time it takes for luggage to reach the travelers is less than 17 minutes. Determine the null hypothesis.
If I know the T-score for those who made an A on a test is 60, the z-score for those that made a B is .5, the number of students total is 200,