Fifty five percent of the students in a class of 135 of planning to go to graduate school, Find the variance of the binomial distribution

Find the mean variance and standard deviation for the number of heads when 10 coins are tossed.

The mathematics achievemnet test cscore of 750 students were found to have a mean and variance of equal to 600 and 4900, respectively. if the distribution of test scores was approxiametly normally distibuted, how many students scored more than 530? round your answer to the nearest integer.

Find the variance of these data 20,30,15, 18,22 (2 Points)

Professor Hayashi has implemented a new book for his Fall 2013 statistics course. He wants to see if the new book has an effect on the exam average for Exam 3. He knows that the Exam 3 mean for all students who have taken his statistic course over the past 10 years is 77.2. He collects some data from a sample of 9 students and finds that the Exam 3 mean for his Fall 2013 statistics students is 81.7 with a variance of 32.49.Measure effect size using Cohen's D.

Suppose it is known that 37% of Camp Crystal Lake campers return the next summer. A random sample of 15 campers was selected. 3. (Describe the distribution of the number of campers that return the next summer.

An average of many different studies of handedness indicate that in a random sample of ​adults,14percent of men are​ left-handed and 6 percent of women are​ left-handed. (Assume the rest are​ right-handed.) Suppose you have a sample of 250 women and 100 ​men, in which the numbers of​ left-handed and​ right-handed people reflect the average percentages. Make a​ two-way table that shows the distribution you would find.

The proportion of a in the tail of a gold distribution can be never be more than .50 true or false

Indicate whether the five number summary corresponds most likely to a distribution that is skewed to the left, right or symmetric (100, 110, 115, 160, 220)

Explain how the variance in the numerator and denominator of each F-ratio of a 2-way ANOVA is determined.