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What can we say about the shape of the distribution of the sample mean? What percent of the sample means will be greater than 142 but less than 155 seconds?
The company wants to know how many pounds of each chemical ingredient to put into a bag of fertilizer to meet the minimum requirements of 20 ounces of nitrogen, 36 ounces of phosphate, and 2 ounces
Consider college officials in admissions, registration, counseling, financial aid, campus ministry, food services, and so on. How much money do these people make each year?
Decide whether you can reject Ho and accept Ha or not. Determine the observed p-value for the hypothesis test and interpret this value. What does this mean?
An electronics store receives a shipment of 20 graphing calculators, including 3 that are defective. Four of the calculators are selected to be sent to a local high school. How many selections can b
Compute the revenue taken at the four prices mentioned in this problem -- $ 2.05 , $ 2.70 , $ 2.95 and your answer to part
A researcher conducts an independent -measures research study and obtains t =2.070 with df= 28.
Find the probability that the number who say oatmeal raisin is their favorite cookie is exactly four. round the answer to three decimal places.
In a water treatment plant, the level of turbidity. Find the equation of the line using the least squares method that best describes the data.
Using the method of ANOVA at a significance level of 0.05, test whether a difference exists between the average protein content of different brands of milk.
Standard deviation 0.16, what is the probability that the mean of a sample of size 36 will differ from the population mean by more than 0.06?
Two processes are used to produce forgings used in an aircraft wing assembly. Of 200 forgings selected form process1, 10 do not conform to the strength specs, whereas 300 forgings select
Separately choose at random 2 of those under 21 to interview about attitudes toward alcohol. You have given every student at the party the same chance to be interviewed. What is the chance?
In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the
Find the probabilities that the service times willbe less than 1/2 hour, 1/3 hour, and 2/3 hour. Com-pare these probabilities to the probabilities found in the example.
Hypothesis testing: must state the null and the alternate hypotheses in WORD first, then go through the process of hypothesis testing. At 0.05 level of significance, can you claim that the mean deliv
The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is one minute. what is the 95% confidence interval f
Use exponential smoothing to determine the forecast of shipments for the year 1999. Use the actual shipments for 1990 as the starting forecast for 1991. Use a smoothing constant of α = 0.4.
Which method is more suitable for forecasting factory orders? Hint: Compare the two methods based on Mean Absolute Deviation (MAD)?
Is this sample sufficient to conclude that the eye-spots have a significant influence on the birds' behavior? Use a two-tailed test with α= .05.
If we are interested in determining an interval estimate for m at 86.9% confidence, what is the z value to use ?
A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distribute
A researcher is interested to see if walking for 30 minutes a day helps women lose weight. What is the parameter of interest.
Suppose we are interested in testing if there is a difference in the mean systolic blood pressure for men and women. Find the test statistic to test the hypothesis.