Statistics and Probability Answers

Suppose you just received a shipment of
seven
seven televisions.
Two
Two of the televisions are defective. If two televisions are randomly​ selected, compute the probability that both televisions work. What is the probability at least one of the two televisions does not​ work?

school pep rally,. Randomly drew 36 names out of basket. Of the prize winners, 6 were freshmen, 14 were sophomores, 9 were juniors, and 7 were seniors. School is 30% freshmen, 25% sophomores, 25% juniors, and 20% seniors. a. What are the expected frequencies of winners from each class? Expected frequency would be that the freshmen would hold the most prizes (being the largest class) followed by sophomores and Juniors and lastly the seniors as they have a smaller population. b. Conduct a significance test to determine whether the winners of the prizes were distributed throughout the classes as would be expected based on the percentage of students in each group. Report your Chi Square and p values.
c. What do you conclude?

You are going to test the claim at least 60% of women

do the income taxes for their household.

If you use a significance level of 0.05,

what will the critical number be for your rejection region?

See Table A-2 for your answer

A random sample of 50 perceived age estimates for a model in a cigarette advertisement showed that Picture = 26.72 years and that s = 3.7323 years.

(a)
Use this sample to calculate a 95 percent confidence interval for the population mean age estimate for all viewers of the ad. (Round your answers to 3 decimal places.)

The 95 percent confidence interval is [
,
].

(b)
Remembering that the cigarette industry requires that models must appear at least 25 years old, does the confidence interval make us 95 percent confident that the population mean perceived age estimate is at least 25? Is the mean perceived age estimate much more than 25?

, than 25.

If P(A) = 0⋅50, P(B) = 0⋅ 40 and P(A ∪ B) = 0⋅70,find P(A | B) and
P(A B), c ∪ where c A is the complement of A. State whether A and B are
independent. Justify your answer.

If P(A) = 0⋅50, P(B) = 0⋅ 40 and P(A ∪ B) = 0⋅70,find P(A | B) and
P(A B), c ∪ where c A is the complement of A. State whether A and B are
independent. Justify your answer.

A bag contains 8 blue balls and 5 black balls. 2 successive draws of 3 balls are made without replacement. find the probability that the first drawing will give 3 black balls and the second 3 blue balls.

A survey was recently done in a certain town to determine readership of newspapers available. 50% of the resident read Daily Nation, 60% read the standard and 20% read both newspapers. Determine the probability that a resident selected does not read any newpaper.

A survey was recently done in a certain town to determine readership of newspapers available. 50% of the resident read Daily Nation, 60% read the standard and 20% read both newspapers. Determine the probability that a resident selected does not read any newspaper.

An athlete is running in four races and in each race she has 60% chance of winning. What is the probability that she will win atl east two races?