Stats Help for College-level Students

Statistic problem

2 Questions: 3) Using the CIELO data, calculate 95% and 99% confidence intervals for the percentage intending to purchase the CIELO. (see attachment for full question)

Statistic problem

Test the hypothesis that there is no difference in the age of the death for the United States Presidents and Vice Presidents. (see attachment for full question)

Statistics

Because of a recent incident in which a number of people became ill after eating undercooked hamburger meat, intensive interest has centered around the cooking time for hamburger patties. In the past, the cooking time at a local fast food firm has been found to be uniformly distributed between 4 and 5 minutes. a) A TV report ...continues

Statistics problem

1) A survey revealed that 21.5% of the households had no checking account, 66.9% had regular checking accounts, and 11.6% had NOW accounts. Of those households with no checking account 40% had savings accounts. Of the households with regular checking accounts 71.6% had a savings account. Of the households with NOW accounts 7 ...continues

Statistics: normally and binomially distributed random variables

1) A videotape store has an average weekly gross of $1,158 with a standard deviation of $120. Assuming this to be a normally distributed random variable, calculate the following: a. Probability the weekly gross will exceed $1,261. b. Proportion of weeks the weekly gross is less than $1,080. c. Probability the weekly gross is ...continues

Statistics

12) The physical science degrees conferred by a school between 1992 and 1995 were broken down as follows: Major Male Female Totals Physics 25 25 50 Chemistry 60 40 100 Geology 30 20 50 Totals 115 85 200 Suppose a person is selected at random f ...continues

Word Problem

At the time she was hired as a server at a restaurant, Beth was told she could average more than $20.00 a day in tips. Over the first 35 days she was employed, the mean daily amount of her tips was $24.85, with a standard deviation of $3.24. At the .01 significance level, can Beth conclude that she is earning an average of more ...continues

Word Problem

At the time Beth was hired as a server at a Restaurant, she was told she could average $20 a day in tips. Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $24.85 with a standard deviation of $3.24. At the .01 significance level, can Beth conclude that she is earning an average of ...continues

Statistics word problem - testing hypothesis

Fast Service, a chain of automotive tune-up shops, advertises that its personnel can change the oil, replace the oil filter, and lubricate any standard automobile in 15 minutes, on the average. The National Business Bureau received complaints from customers that service takes considerably longer. To check the fast service claim, ...continues

Word Problem - calculating P-value and F test

One reads that a business school graduate with an undergrad degree earns more than a high school grad with no additional ed, and a person with a master's or a doctorate earns even more. To test this a random sample of 25 executives from compainies with assests over 1 million were selected. Their incomes, classified by highes ...continues