I need help with reaching to correct answers, If there are calculator options how do i enter them. The high lighted answers are what I put but i am only sure of the ones that have only one answer

• Items produced on an assembly are supposedly normally distributed with a mean of 27 and a standard deviation of 2.5 inches. Given this information what is the probability of getting a single item from this assembly line with a length between 26 and 28 inches long?

0.310843

• in an experiment there are only three outcomes which are mutually exclusive: x=1, x=2 and x=3. If the P(x=1) = 0.3 and the P(x=2) = 0.2 what is the "expected value of x" denoted as E(x)?

1.2

2.2

3.2

More information is needed to answer this question.

• All probability values must be between from zero to one, including those values.

True

False

• If P(A) = 0.50 and P(B) = 0.60 and "the probability of A and B" equals 0.40 then what's "the probability of A given B"?

0.3

0.5

0.6

0.666667

none of the above is close

• In an experiment there are only three outcomes which are mutually exclusive: x=1, x=2 and x=3. If the P(x=1) = 0.3 and the P(x=2) = 0.2 what is the P(x=3)?

0.2

0.3

0.5

We don't know because it wasn't given.

• A man puts somewhere between 27 and 42 apples in a basket. What's the probability that he puts fewer than 35 apples in it?

0.5

• The "union" of two events and the "intersection" of two events is the same thing.

False

1. The values {5, 8, 10, 7, 10, 14} represent the data from a simple random sample taken from a population that is known to be normally distributed. Given this information what is the value for the point estimate for the population standard deviation? Give your answer to six-decimal place accuracy.

Sx=3.098386677

• On an assembly line a sample of size 5 is taken from a large population which has a historical defect rate of 0.2 percent. Given this information what is the probability that exactly two of the five are defective if, in fact, the true population defective rate hasn't changed?

0.000040

0.003765

0.204800

0.317500

None of the above answers is close

• On an assembly line which produces bottles it has been historically noted that each bottle, on average, has 2.86 defectives on it. If a sample of size one is taken, what is the probability that this item will be defective free?

0.057269

0.058825

0.075844

None of the above answers is close

• The "Combination of five things taken two at a time" " has what value?

7

2

10

5

• If the P(A) = 0.20 what is the "complement of A"?

0.20 also

0.50

0.80

more information is needed to answer the question

• If a sample of size 50 is taken from a population that is known to have auniformdistribution, the resulting sampling distribution will have what shape?

a uniform distribution too

a triangular distribution

a leptokurtic distribution

a normal distribution

none of the above answers is correct

• If a sample of size 50 is taken from a population that is known to have anexponentialdistribution, the resulting sampling distribution will have what shape?

an exponential distribution too

a triangular distribution

a leptokurtic distribution

a normal distribution

none of the above answers is correct

• If a sample of size 50 is taken from a population that is known to have aWeibulldistribution, the resulting sampling distribution will have what shape?

an exponential distribution

a Weibull distribution

a Beta distribution

a normal distribution

none of the above answers is correct

• The time between arrivals of customers at a particular store has a mean of 12 minutes. Given this information, what is the probability that the arrival time between two randomly chosen customers is 12 minutes or less?

0.367879

0.437865

0.50

0.632121

None of the above is close

We need the standard deviation in order to work this problem

• Previous shipments of size 50 from ABC have historically contained 6 defective items in it. Since we don't want to sample all fifty items in the shipment received today, we take a random sample of size 4 and determined that exactly two of the four were defective. What is the probability of this occurring if, in fact, the quality procedures at ABC have neither deteriorated nor improved?

0.061615

• items produced on an assembly are supposedly normally distributed with a mean of 27 and a standard deviation of 2.5 inches. Given this information what is the probability of getting a single item from this assembly line with a length that is exactly and precisely 27 inches long?

exactly 0.50

slightly more than 0.50

slightly less than 0.50

about 0.724991

None of the above are close

• The values {5, 8, 10, 7, 10, 14} represent the data from a simple random sample taken from a population that is known to be normally distributed. Given this information what is the value for the point estimate for the population mean?

9

• Statistics is not a math class, but rather a class in language, logic and art.

True

• An event is a collection of what?

a random event

sample points

a data set

a population

• A man puts somewhere between 27 and 42 gallons of gas in abarrel. What's the probability that he puts less than 35 gallons in it?

Question 22 options:

0.466667

0.5

0.533333

0.5625

None of the above is close

• A sample of size 200 was taken from a large population in order to determine the population proportion of people who favored candidate A in the upcoming election. Of the 200 people chosen, 125 of them chose candidate A, 70 of them chose someone else and five were undecided. Given this information, what is the point estimator for the proportion of people who favor candidate A?

0.025

0.350

0.625

None of the above is close

We need the standard deviation before we can answer it

• A random variable is a numerical description of the outcome of an experiment.

True

The value of "zero factorial" is one.

True