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At the .01 level of significance, is the mean grade of the female students higher than that of the males?
Simulate 1000 iterations of the two strategies over the 6-year period. Create a histogram of the final fund values. Based on your simulation results, which of the two strategies would you recommend
2 percent of the homes with T.V. sets served by cable T.V. If a random sample of 6 is taken from these homes find the probability distribution of x where x is the number of T.V. homes in the sample
In a nationwide survey of n = 1,030 adults, 6% answered yes to the question "During the last year did anyone break into or somehow illegally get into your home or apartment?" A 98% confidence interv
What is the expected value of a lottery ticket where there are only 10 chances in ten millions of winning the grand prize of $100 million?
In January 2006, the Web site for M&M TM candies claimed that 24% of plain M&M candies are blue, 20% are orange, 16% green, 14% yellow, and 13% each red and brown. You select one M&M ca
The PG County conducts annual surveys with twenty-five randomly assigned members of the community to evaluate their perception of safety. If the person claims that the criminal activity has not chan
A statistician needs to survey a sample of 50 people that is representative of voters in his community. He prepared a list of phone numbers of 50 randomly selected, expected voters. Next morning, he
a. What decision should be made by the optimist? b. What decision should be made by the conservative?
Out of 400 students in a school, 279 passed the exam. What would be the mean of the sampling distributions of the proportion of students who passed the exam in the school?
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, regardi
A sample of 35 quarterbacks averaged 38 passing attempts per game. If the standard deviation is 4.7, what is 95% confidence interval for the population mean?
The Associated Press (October 9, 2002) reported that in a survey of 4722 American youngsters aged 6 to 19, 15% were seriously overweight. Calculate and interpret a confidence interval using a 99% co
A researcher calculates the expected value for the number of girls in three births. He gets a result of 1.5. He then rounds the result to 2, saying that it is not possible to get 1.5 girls when thre
There is a machine that produces 95 items per minute. Some of these items are not up to quality specifications and have to be thrown out. At this rate, how many mistakes can be made while maintainin
The researcher now is wondering if men who themselves have just become new fathers will score higher on the scale than men in general. She samples a group of 100 new fathers and finds that their me
The average weight of males in the freshman class of a certain college is 75.4kg, with a standard deviation of 7.6kg. Assume normal population. Interpret your result in each question.
This semester a sample of 45 students revealed an average cost of books of $370 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this h
A study was conducted to determine if there was a relationship between the prices a non-member of a book club paid for various publications and the prices that a member paid for the same publication
Which of the following is a correct statement about a probability?
The manager of the local grocery store has determined that, on the average, 4 customers use the service desk every half-hour. Assume that the number of customers using the service desk has a Poisson
You have been offered a business deal. You estimate that there is a 3% chance of making $100,000; 7% chance of making $40,000; a 20% chance of making $10,000; and 70% chance of making $0. How much s
The average height of flowering cherry trees in a certain nursery is 9.5 feet. If the heights are normally distributed with a standard deviation of 1.3 feet, find the probability that a tree is less
Suppose a sample of 380 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. a)Compute the value of the test statistic (to 3 decimals)