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Inference for distributions

a). Find the mean IQ scores for girls and for boys. It is common for boys to have somewhat higher scores on standardized tests. It that true? b). Compute 95% T intervals of the Girls' IQ's and the Boys' IQ's and explain what these intervals mean. c). Make a histogram for each set of data to determine whether each distribution is reasonably symmetric with no outliers. If this is so, we can use t- procedures-do your histograms indicate that we can use t-procedures? d). Give a 90% 2-Sample T interval confidence for the mean difference between the mean IQ scores for all boys and girls in the district. Then explain what this interval means.

Subject:

Statistics

Topic:

All Topics

Posting ID:

5563

OTA ID:

103506

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ANOVA question

I have a question about two-way ANOVA. Here is my experiment. There are two groups of sucjects A(n=50) and B(n=60). Each subjects has to test five different concentrations of a solution (5%,10%, 20%, 40%, 80%). When a subject tastes a solution, he gives it a score how he likes it (from 1 to 10). I need to analyze how the ratings depend on group and solution. I am using a two-way ANOVA. What would be the correct df for this problem? The total df.-- IS it 110-1? But the total number of observations is 5 * 110... stat package gives me total df 554. Did I enter the data wrong? Also, what if an interaction of the two factors is significant, can I perform any comparisons between different ... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

5577

OTA ID:

103506

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Statistics

Expected value, confidence interval and significance level calculation.

Subject:

Statistics

Topic:

All Topics

Posting ID:

5578

OTA ID:

103060

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Statistics

The data in the table that follows was collected by a large car manufacturer concerning a new prototype car called the CIELO. Thirty carefully selected respondents were shown the car and fully briefed about its capabilities. Here is the data, which includes age (intervally scaled), sex (nominal), social status (interval scale ranging from 10, low status, to 30, high status), attitude toward CIELO (interval scale ranging from 6, negative attitude, to 30, positive attitude) and intention to purchase CIELO (nominal, yes or no). 1. Is there any difference in male and female attitudes toward the CIELO? 2. What is the relationship between intention to purchase and gender? 3. Is there anything u... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

5579

OTA ID:

101733

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Probability

1.) If you buy a box of Wisk, the probability of getting a scoop is 97%. If you buy 9 boxes over the next several months, what is the probability of missing two scoops? 2.) The average length of a cellular phone call in the US is 3.4 minutes. If the standard deviation of those calls is .07 minutes (population standard deviation), what is a 99% confidence interval? We calculated the mean from 86 cellular calls. 3.) A customer service agent gets a call every 6 minutes. What is the probability that the agent will get less than 8 calls during the third hour she works?

Subject:

Statistics

Topic:

All Topics

Posting ID:

5580

OTA ID:

103477

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