trying to get the difference between prospective and retrospective

trying to get the difference between prospective and retrospective

Customers have the probabilities of 0.5 for HuluPlus, 0.2 for Cable TV, and 0.3 for the Times to convert after seeing an ad. The costs of advertising are also different: it is $2/ad, $3/ad, and $0...

The brand new video scoreboard at Wrigley Field in Chicago requires a special computer component that burns out somewhat frequently but is easily replaced. There are 100 of the components to be used,...

A spinner has 10 equally sized sections, 1 of which is red and 9 of which are blue. The spinner is spun and at the same time a fair coin is tossed. What is the probability that the spinner lands on...

An employer interviews 9 people for 5 management positions in a company, and 4 of the 9 people are women. If all 9. are qualified, in how many ways can the employer fill the management positions if...

In a population of voters, 30% favour an election issue, and 70% do not favour it. In a survey it is found that 40% of those who favour the issue vote for the ruling party, while 80% of those...

The area to the right of zequals=negative 1.42−1.42 under the standard normal curve is nothing.

An employer interviews 9 people for 6 management positions in a company, and 4 of the 9 people are women. If all 9 are qualified, in how many ways can the employer fill the management positions if...

Teachers’ salaries in one state are very low, so low that educators in that state regularly complain about their compensation. The state mean is $33,600, but teachers in one district claim that the...

Suppose the horses in a large stable have a mean weight of 818lbs , and a variance of 3481 .What is the probability that the mean weight of the sample of horses would differ from the...

Three research department have 9,10 and 8 members respectively. Each department is to select a delegate and an alternate to represent the department at a conference. In how many ways can this be done...

In how many ways can a committee consisting of 2 faculty members and 5 students be formed if there are only 11 faculty members and 12 students eligible to serve on the committee?

In how many ways can a committee consisting of 2 faculty members and 5 students be formed if there are only 11 faculty members and 12 students eligible to serve on the committee?

An employee interviews 10 people for 5 technical support positions in a company, and 5 of the 10 of the people are woman. If all 10 are qualified in how many ways can the employer fill the technical...

On a questionnaire designed to measure empathy, the mean score for the general population is 30.6. Random sampling of 25 scores obtained from individuals who were bullied yielded a mean of 39.5 and...

The assumption of the F test for comparing two variances is that both populations are normally distributed. Why would validating these assumptions be a matter of statistical ethics? Is validating...

Determine the area under the standard normal curve that lies... A. To the left of -2.34 or to the right of 1.645. B. Between -0.88 and 2.55 C. To the left of -1 or to the right...

Scientific Method: Stating a hypothesis, Collecting data using some sort of sampling plan; Rejecting or not rejecting the hypothesis. How would you describe the process of moving from a null...

Find the Z score for the weights of Middle school boys which are approximately Normal, mean = 130 lbs, Standard Deviation = 7, if Johnny weighs 148 lbs, What's his Z score?

The failure rate in a statistics class is 20%. In a class of 50 students, find the probability that less than eight students will fail. Pleaseeeee I need HELPPPP