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9 short answer type questions on mean, standard deviation, range, probability, permutation

1. Compute the arithmetic mean for the following data: 8, 2.2, 25, 7, -9, 10, 2, and 5.9. 2. An Embry-Riddle senior performed the same experiment on three groups of subjects (with permission!) and obtained mean scores of 84, 69 and 76. The groups consisted of 13, 31, and 27 subjects respectively. What is the overall mean for all subjects? 3. For any distribution, the mean will have a z score equal to: ____________________. 4. A large set of sample scores yields a mean and standard deviation of 75.00 and 5.00 respectively. The distribution is roughly bell-shaped. What percentage of scores should fall between the values of 70.00 and 80.00? 5. Which grouping of scores exh... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

4603

OTA ID:

103060

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Questions on probability distributions - Binomial, Poisson

1 The Kwik Klean Car Wash loses $30 on rainy days and gains $120 on days when it does not rain. If the probability of rain is 0.15, what is the expected value of net profit? 2. The Newman Construction Company bids on a job to construct a building. If the bid is won, there is a 0.7 probability of making a $175,000 profit and there is a probability of 0.3 that the contractor will break even. What is the expected value? 3. Assume that in a binomial experiment, a trial is repeated n times. Find the probability of x successes given the probability p of success on a given trial with n = 12, x = 7 and p = 0.4. (Use Table A-1) 4. Several students are unprepared for a true/false test with 50 q... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

4604

OTA ID:

103060

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Hypothesis Testing - Compute the statistical test using the t test and decide what to do with the null.

School A states the average number of days missed by each student is 4.0. Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1, and 6.At the .05 level of significance, is there convincing, evidence that the number of absences per student has increased?

Subject:

Statistics

Topic:

All Topics

Posting ID:

4638

OTA ID:

103060

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Hypothesis Testing -Compute the statistical test using the t test and decide what to do with the null.

A sample of scores on an examination given to both males and females in QNT 575 are: Males - 72,69,98,66,85,76,79,80,and 77 Females - 81,67,90,78,81,80, and 76 At the .01 level of significance, is the mean grade of the female students higher than that of the males? I need a step by step calculation of the problem. I need to know how to get the mean and the standard deviation as well as the answer to the problem. Thanks for your help.

Subject:

Statistics

Topic:

All Topics

Posting ID:

4639

OTA ID:

103059

View Details $1.99 Download Add to Cart

Penrose Consulting

Draw a scatter plot of these two variables. Based on this plot only, does it appear that a linear relationship exists between the two variables? b) Compute the correlation coefficient and discuss what it measures. c) Test to determine whether the population correlation coefficient is actually 0, using an alpha level of 0.05. d) Compute the least squares regression equation using money collected as the dependent variable and number of alumni contacted as the independent variable. For this model, compute, and interpret, the following: 1) R-square 2) Standard error of the estimate 3) 90% confidence interval estimate for the true slope coefficient 4) 95% prediction interval... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

4640

OTA ID:

103060

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