1. The percentage of MZ twin pairs studied concordant for mental retardation is 97%, while the concordance of this trait in DZ twins is 37%. Assuming that both twins in each pair were raised together in the same environment, what do you conclude about the relative importance of genetic versus environmental factors in this trait?

The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 387 employed persons and 359 unemployed persons are independently and randomly selected, and that 243 of the employed persons and 202 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers ( p1 ), who have registered to vote, exceeds the percentage of unemployed workers ( p2 ), who have registered to vote? Use a significance level of α=0.01 for the test.

State the null and alternative hypotheses for the test

Find the values of the two sample proportions, pˆ1 and pˆ2. Round to 3 decimal places

Compute the weighted estimate of p, p‾. Round to 3 decimal places

Compute the value of the test statistic. Round to 2 decimal places

Determine the decision rule for rejecting the null hypothesis H_0. Round to 3 decimal places [ (Reject H₀ if (t or absolute value of t) is (< or >)   (value) ]

Make a decision to reject or fail to reject the null hypothesis.

For mallard ducks and Canada geese, what percentage of nests are successful (at least one offspring survives)? Studies in Montana, Illinois, Wyoming, Utah, and California give the following percentages of successful nests (Reference: The Wildlife Society Press, Washington, D.C.). x: Percentage success for mallard duck nests 17 86 59 47 29 y: Percentage success for Canada goose nests 24 18 18 51 51 (a) Use a calculator to verify that Σx = 238; Σx2 = 14,216; Σy = 162; and Σy2 = 6,426. Σx Σx2 Σy Σy2 (b) Use the results of part (a) to compute the sample mean, variance, and standard deviation for x, the percent of successful mallard nests. (Round your answers to two decimal places.) x s2 s (c) Use the results of part (a) to compute the sample mean, variance, and standard deviation for y, the percent of successful Canada goose nests. (Round your answers to two decimal places.) y s2 s (d) Use the results of parts (b) and (c) to compute the coefficient of variation for successful mallard nests and Canada goose nests. (Round your answers to one decimal place.) x y CV % % Write a brief explanation of the meaning of these numbers. What do these results say about the nesting success rates for mallards compared to Canada geese? The CV is the ratio of the standard deviation to the mean; the CV for Canada goose nests is higher. The CV is the ratio of the standard deviation to the mean; the CV for Canada goose nests is equal to the CV for mallard nests. The CV is the ratio of the standard deviation to the mean; the CV for mallard nests is higher. The CV is the ratio of the standard deviation to the variance; the CV for Canada goose nests is higher. The CV is the ratio of the standard deviation to the variance; the CV for Canada goose nests is equal to the CV for mallard nests. The CV is the ratio of the standard deviation to the variance; the CV for mallard nests is higher. Would you say one group of data is more or less consistent than the other? Explain. The x data group is more consistent because the standard deviation is smaller. The two groups are equally consistent because the standard deviations are equal. The y data group is more consistent because the standard deviation is smaller.

In baseball, is there a linear correlation between batting average and home run percentage? Let x represent the batting average of a professional baseball player, and let y represent the player's home run percentage (number of home runs per 100 times at bat). A random sample of n = 7 professional baseball players gave the following information.

x 0.255 0.251 0.286 0.263 0.268 0.339 0.299

y 1.5 3.9 5.5 3.8 3.5 7.3 5.0

(a) Make a scatter diagram of the data. Then visualize the line you think best fits the data.

(b) Use a calculator to verify that Σx = 1.961, Σx2 = 0.555, Σy = 30.5, Σy2 = 152.69 and Σxy = 8.842. Compute r. (Round to 3 decimal places.)

As x increases, does the value of r imply that y should tend to increase or decrease? Explain your answer.

Given our value of r, we can not draw any conclusions for the behavior of y as x increases.

Given our value of r, y should tend to remain constant as x increases.

Given our value of r, y should tend to increase as x increases.

Given our value of r, y should tend to decrease as x increases.

A common size balance sheet expresses the balance sheet items as a percentage of total assets.

Select one:

True

False

Q. Which of the following institutional investors most likely must spend a target percentage of the portfolio annually?

1- Endowments

2- Life insurance firms

3- Property and casualty insurance firms

Q. All else being equal, which bonds typically have the widest credit spreads?

1. A-rated corporate bonds

2. AA-rated corporate bonds

3. AAA-rated corporate bonds

Q. In the structure of a typical private equity fund, investors are commonly referred to as:

1. limited partners.

2. general partners.

3. public shareholders.

Q. The buyer of an option contract:

1. receives the premium when the contract is initiated.

2. must trade the underlying asset at the exercise price.

3. has the right to trade the underlying asset at the exercise price.

Q. In primary security markets investors buy securities from:

1. traders.

2. issuers.

3. exchanges.

Calculate the federal debt and year-over-year percentage growth. Explain the economic impact.

Q. Which of the following institutional investors most likely must spend a target percentage of the portfolio annually?

1. Endowments
2. Life insurance firms
3. Property and casualty insurance firms

Q. All else being equal, which bonds typically have the widest credit spreads?

A. A-rated corporate bonds

B. AA-rated corporate bonds

C. AAA-rated corporate bonds

A basketball player with a 65% shooting percentage has just made 6 shots in a row. The announcer says this player “is hot tonight! She's in the zone!” Assume the player takes about 10 shots per game. Is it unusual for her to make 6 or more shots in a row during a game?

Model each component using equally likely random digits. Run ten trials

*I'm aware that I'll be using 10 two-digit numbers of 00-64 (indicates the player made the shot) and 65-99 (indicates the player didn't make the shot) but my question is how do I know when the trial outcome will equal a yes or no? I was looking at this question in the link and am not sure how they selected yes and no in the random number table. Also, how do I write out the random numbers should I be using a program? : https://www.chegg.com/homework-help/hot-hand-basketball-player-65-shooting-percentage-made-6-sho-chapter-10-problem-39e-solution-9780321986498-exc

A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within

2 percentage points with 99​% confidence if

​(a) he uses a previous estimate of 36​%?

​(b) he does not use any prior​ estimates?