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The manager of a Farmer Jack Super Market would like to know if there is a preference for the day of the week on which customers do their shopping. A sample of 420 families revealed the following. At the 0.05 significance level, is there a difference in the proportion of customers that prefer each day of the week?
1. State null and alternate hypothesis.
2. State the decision rule.
3. Compute the value of the statistic.
4. What is the decision. interpret the result.
Day of the week Number of persons
Monday 20
Tuesday 30
Wednesday 20
Thursday 60
Friday 80
Saturday 130
Sunday 80
A sustained long-term change in the level of the variable that is being forecasted per unit of time is: (A trend, A time series, Seasonality or A change due to business cycles)
The superintendent of a printing plant has selected a random sample of 100 rolls of paper from a large shipment. The average length of the sample rolls is 416 feet, with a variance of 2704 feet.
A jar contains marbles of different colors: 4 white, 6 black, 6 red, and 4 blue. On two random drawings, without replacement, find the probability that the first is black and the second is white.
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Based on these results, does the diet appear to be effective? Does the diet appear to have practical significance?
Can college conclude that students in new program are significantly different from rest of freshmen class? Use two - tailed test with a = 0.05.
Discuss why the independent t-test is called independent. What does this analysis have to do with variance within and between groups?
A rocket fires two engines simultaneously. One produces a thrust of 800N directly forward while the other gives a thrust of 508N at an angle 38.2^circ above the forward direction.
Test whether the mean weight is less than 10 pounds. Use P-value approach.
Use an alpha level of .01 and test the hypothesis that the two methods are producing the same mean.
The appropriate use of multiple regression depends on being able to make four basic assumptions about the data being used to develop the regression model:
Powers Tire Company (Which specializes in tires for vehicles ca. 1965) needs your expertise to help them schedule over the next three months. They can make tires using regular labor, or subcontracting.
A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is $125.
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