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Comparisons Involving Proportions and a Test of Independence

Does age make a difference in the amount of savings a worker feels is needed to be secure at retirement? A study by CommSciences for Transamerica Asset Management found that 0.24 of workers in the 25-33 age category feel that $250,000 to $500,000 is enough to be secure at retirement. In the 34-52 age category already 0.35 of the workers feel that this is enough. Suppose 210 workers in the 25-33 age category and 176 workers in the 34-52 age category were involved in this study. Use these data to construct a 90% confidence interval to estimate the difference in population proportions on this question.

Subject:

Statistics

Topic:

All Topics

Posting ID:

4885

OTA ID:

101733

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Regression

a. Fit a logistic regression model to predict the probability of successful completion of the MBA program based on undergraduate grade point average and GMAT score. b. Explain the meaning of the regression coefficients for the model fit in (a). c. Predict the probability of successful completion of the program for a student with an undergraduate grade point average of 3.25 and a GMAT score of 600. d. At the .05 level of significance, is there evidence that a logistic regression model that uses undergraduate grade point average and GMAT score to predict probability of success in the MBA program is a good-fitting model? e. At the .05 level of significance, is there evidence that under... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

4903

OTA ID:

103314

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Regression

4. Fit to the data a quadratic polynomial model. Test your model for adequacy of fit and for appropriateness. 5. In which of the four quarters does the seasonal component reach its peak? In which does it reach its trough? Explain.

Subject:

Statistics

Topic:

All Topics

Posting ID:

4904

OTA ID:

103314

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Testing a hypothesis.

A Baker says they can make a cake in 60 minutes from scratch, which I do not think he can. After watching them 18 times I come up with the Mean time of 65.37 minutes with a standard deviation of 8.2 minutes Using the Student's t Distribution because I have a small sample, I'll let my null hypothesis be: Ho: m = 60 and since I want to prove that his mean time is greater than the 60 minutes, I'll set up my alternate hypothesis like this: H1: ยต > 60 If I find my sample "test statistic" and then test it against the critical value, I can determine, once and for all whether I can safely reject the bakers's claim. I think that an alpha of 0.05 should be adequate. ---------------... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

4993

OTA ID:

101733

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Calculating the mean and standard deviation from the given situation.

Find the mean and standard deviation for the random variable x, the number of defects per pack produced, if 20 packs of digits are produced, with a 3% rate of defects.

Subject:

Statistics

Topic:

All Topics

Posting ID:

5020

OTA ID:

103060

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