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Suppose that it is a presidential election year and Ohio is one of the 'swing' states. Your polling company wants to conduct a presidential preference poll of the citizens of Ohio to predict which candidate will win the election.
a. How many voters must be polled to be 95% confident of your results within +/- 3%?
b. How many voters must be polled to be 95% confident of your results within +/- 2%?
c. How many voters must be polled to be 95% confident of your results within +/- 1%?
d. Discuss the effect of margin of error on sample size.
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
At the .10 significance level you will test to determine if there has been an increase in selling time. What is your decision?
The distribution of 9 ounce bags of a particular bag of potato chips is approximately Normal with a mean of 9.12 ounces and a standard deviation of 0.15 ounces.
A startup company began manufacturing toy dolls tailored to environmental-oriented customers. Using linear regression, find a linear model for the Cost Function if the company's yearly costs for the next five years were (2005,$8,000,000),(2006,$1..
Determine the probability of having more than 3 defects in a roll?
Sketch a scatter plot that could represent data from each of following. Label the axes to indicate the independent and dependent variable.
I want to establish if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.
At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule.
If he selects the three brands at random, what is the probability that he will select the following?
In an article entitled "Fuel Economy Calculations to Be Altered," James R. Healey indicated that the government planned to change how it calculates fuel economy for new cars and trucks.
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