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1. The amount of time a bank teller spends with each customer is normally distributed with a population mean of 3.20 minutes and standard deviation of .40 minutes. If a random sample of 16 customers is selected, what is the standard deviation o the sample mean? Possible answers: a) 3.2 minutes b) 0.40 minutes c) 0.025 minutes d) 0.1 minutes e) 8.0 minutes
2. According to the Central Limit Theorem, what will happen to the histogram of averages as n increases? Possible answers: a) It depends on the mean and standard deviation b) The histogram will begin to look more ike the original distribution c) The histogram will begin to look less like the normal curve d) Increasing n will not affect the histogram of averages e) The histogram will begin to look more like the normal curve
What is the 95% confidence interval estimate for the difference between the mean reflectivity reading for Paint A and Paint B? Please complete the blank: "we can be 95% confident that the true difference between the actual means is?
let w be x212a determine the mean and the variance of wb find d1d2d3 and d4 so that pw gt d1 0.05 p w gt d2 0.99 pw
1 if we are very certain that the true standard deviation of the number of defects per screen is below 2 what sample
Using the data, construct a 95% lower confidence interval on mean battery life. Why would the manufacturer be interested in a one-sided confidence interval?
A study wants to determine if taking fish oils can reduce depressive symptoms. A group of 50 volunteers who suffered from mild depression were randomly divided into two groups. Each person was given a three-month’s supply of capsules. One group was g..
suppose the coffee industry claimed that the average u.s. adult drinks 1.7 cups of coffee per day. to test this claim a
Illustrate what amount of sales would be required to be a super savings club member. Elucidate amount of sales would be required to be a gold club status.
the probability that an automobile being filled with gasoline also needs an oil change is 0.25 the probability that it
the probability to catch disease a is 10. the probability to get disease b is 17. the probability to get at least one
Assume that the population means are to be estimated from the sample described below. Use the sample results to approximate the margin of error and 95% confidence interval
People were polled on how many books they read the previous year. How many subject are needed to estimate the number of books read the previous year within one book with 99% confidence?
a researcher wishes to compare the effect of the rate of stepping on heart rate in a step-aerobics workout. a
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