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1. Calculate all measures of central tendency for data that are interval or ratio in measurement2. Calculate the standard deviation for data that are interval or ratio in measurement3. Assume this is a sample of students, calculate a t-test that compares boys and girls on the number of absences (you can assume equal variances). Is there a significant difference in absences between gender?4. Assume this is a sample of students and that students receive an A grade if their score is 90 or above.1. Calculate a chi-square test to determine whether girls achieve more A grades than boys in math.2. Calculate a chi-square test to determine whether girls achieve more A grades than boys in reading.
Standard Test Scores
Name Gender Absences PE Math Writing ReadingAlex Boy 5 49 85 86 80Anthony Boy 18 51 39 71 75Douglas Boy 1 82 74 78 79Jorge Boy 4 56 66 68 60Joshua Boy 5 83 79 78 77Luke Boy 0 94 89 84 84Robert Boy 17 36 36 56 50Rupert Boy 4 24 55 56 52Seth Boy 0 61 92 89 83Wayne Boy 1 65 92 96 91Blair Girl 3 94 59 66 90Brooke Girl 2 75 35 43 46Carmen Girl 0 49 91 91 90Charlita Girl 16 23 49 55 49Kim Girl 2 71 90 92 95Li Girl 1 73 98 93 95Rachel Girl 2 92 87 92 91Sara Girl 3 33 87 93 94Sheetal Girl 0 18 100 97 97Tawayna Girl 14 31 65 55 63
It has been reported that the average US office worker receives 14 fax messages per day. For purposes of this exercise, we will assume that the daily number of fax messages is normally distributed with a standard deviation of 5.0 messages.
What is the difference between strong negative and strong positive correlation? What does zero correlation tell you? Can you share a relationship between two variables that is typically negative?
Using these data, construct a 99% confidence interval to estimate the average number of days and excavator is rented to a client, and assume the number of days per rental is normally distributed in the population.
Students in the social work course received the following course grades. Create a frequency distribution for this data. Compute the mean. Determine the median.
Please explain the term analysis variance so a person without formal statistics education can understand.
Choose one of these tests and describe in your own words, the purpose of the test, any particular assumptions or limitations pertaining to the test, and provide an example where you could employ the test.
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
Different methods - a traditional method, and a web-based self-paced method. Can he conclude, at α = .05, that the test scores in the web-based self-paced method are lower?
The last sample showed a mean and standard deviation of 3.55 and 0.08 inches, respectively. Using α = 0.05, the appropriate decision is?
Prepare a 95% confidence interval for the average grocery bill. Would a 99% confidence interval be narrower or wider than the 95% confidence interval?
Let x be a random variable that represents a braking distance. Find the probability that a randomly selected braking distance is less than 49 meters.
A sample size n=100 is taken from a population that has a proportion p= 1/5. If, in the sample, ^p=0.25, will the 95% confidence interval for p contain the true value of p^is at top p at bottom ^p
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