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A test has a mean of 104 and a standard deviation of 16. We want to be 98% certain that we are within 4 points of the true mean.
What is the required sample size?
The weights of a random sample of cereal boxes that are supposed to weigh one pound are listed here. Estimate the variance of the entire population of cereal box weights with 90% confidence.
Explain distribution of sample means (shape , Expected value , and standard error ) for samples of n=36 selected from population with a mean of m =100 and standard deviation of s=12.
A player of a video game is confronted with a series of opponents and has an 79% probability of defeating each one. Success with any opponent is independent of previous encounters. The player continues to contest opponents until defeated
Then, define probability value in your own words and explain how a probability value of .05 in this example is related to the normal curve.
Either the seed germinates, or it does not. What is the sample space in this problem? Do the probabilities assigned to the sample space add up to 1? Explain. Are the outcomes in the sample space equally likely?
How much time should be allowed if we wish to ensure that at least 9 out of 10 students (on average) can complete it? (round to the nearest minute).
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
The mean monthly demand for steam boilers is 6.8 with a standard deviation of 1.7. Compare the dispersion of these distributions. Which demand pattern has more relative variation? Explain.
Confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 10 milligrams?
If population standard deviation is σ = 8 is effect large adequate to be statistically significant? Use two - tailed effect with α = .05
Find a 95% confidence interval for the population mean concentration of uric acid in this patients blood. What is the margin of error?
Given this information we could use a Z test for two independent means and conclude that indeed the sales are different when the soup is a featured item.
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