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From a population known to have standard deviation of 1.4, a sample of 70 individuals is taken. the mean of this sample is found to be 6.2. find the standard error of the mean Also establish an interval estimate around the sample mean using one standard deviation of the mean.
Don't quite understand the concept of computing confidence intervals. How would confidence intervals determine sampling design and data collection for information gathered.
A population has mean 325 and variance 144. Suppose the distribution of sample means is generated by random samples of size 36.
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? What is the p-value?
What is the probability that a single, randomly selected piece of material will be defective? (Give the answer to two decimal places.)
If a woman purchases Super Cola, what is the probability that it is a diet soda?
A business invests $10,000.00 in a savings account for 2 years, At the beginning of the second year, an additional $3500.00 is invested, At the end of the second year, the account balance is $15,569.75. What is the annual interest rate?
An oil co. is drilling some wells. the results are described as either a dry well or a producer well. Past experience suggests that 10% of exploratory wells are producer wells.
Use the binomial distribution formula to calculate the probability that:
What is the probability that a random sample of size 400 will have less than 49% of the people who balance their checkbooks at least once per month?
Recognize the given samples are independent samples or matched pairs.
Suppose you are given the following estimated regression equation: Debt Ratio = 4000 + .20 Cash Flow. If the t-stat for the slope estimate is 3.25, what can you conclude?
Design a 95 percent confidence interval for the proportion of defectives in a large lot, if a sample of 200 showed 12 defectives.
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