In a recent year, the Better Business Bureau settled 75% of complaints they received. (Source: USA Today, March 2, 2009) You have been hired by the Bureau to investigate complaints this year involving computer stores. You plan to select a random sample of complaints to estimate the proportion of complaints the Bureau is able to settle. Assume the population proportion of complaints settled for the computer stores is the 0.75, as mentioned above. Suppose your sample size is 276. What is the probability that the sample proportion will be at least 2 percent more than the population proportion?

Based on historical data, your manager believes that 27% of the company's orders come from first-time customers. A random sample of 191 orders will be used to estimate the proportion of first-time-customers. What is the probability that the sample proportion is between 0.31 and 0.48?

According to a 2009 Reader's Digest article, people throw away about 9% of what they buy at the grocery store. Assume this is the true proportion and you plan to randomly survey 67 grocery shoppers to investigate their behavior. What is the probability that the sample proportion does not exceed 0.14?

Q2: Using MS Excel Analyze a regression of Air Quality on three covariates CO2, NOx, and Sox

Data Set is as following

How to use CO2, NOx, and SOx to predict the Air Quality? Please provide the formula.

What is the correlations between Air Quality and each of the three factors? What do they mean?

What is the Coefficient of Determination (R Square) of the regression result? What does it mean?

Question 1

For an experiment comparing more than two treatment conditions you should use analysis of variance rather than separate t tests because ________.

Group of answer choices

a test based on variances is more sensitive than a test based on means

separate t tests would require substantially more computations

conducting several t tests would inflate the risk of a Type I error

There is no difference between the two tests, you can use either one.

Question 2

A restaurant manager is considering changing the secret sauce on their hamburgers. To decide which recipe to use, she recruits 15 customers and assigns them to 1 of 3 sauce groups (A, B, or C). She then serves them a plain hamburger with the sauce for their group and asks them to rate their satisfaction with the taste of the sauce on a scale from 1 (disgusting) to 5 (delicious) to see if there is a significant (α = .05) difference in taste. What is the alternative hypothesis for this Analysis of Variance?

Group of answer choices

μA ≠ μB ≠ μC

there is a significant difference in taste between at least one pair of groups

μA = μB = μC

there is no significant difference in taste between at least one pair of groups

Question 3

A restaurant manager is considering changing the secret sauce on their hamburgers. To decide which recipe to use, she recruits 15 customers and assigns 5 different customers to each of the 3 sauce groups (A, B, or C). She then serves them a plain hamburger with the sauce for their group and asks them to rate their satisfaction with the taste of the sauce on a scale from 1 (disgusting) to 5 (delicious) to see if there is a significant (α = .05) difference in taste. What is the critical value for this Analysis of Variance?

Group of answer choices

F crit = 99.42

F crit = 19.41

F crit = 6.93

F crit = 3.88

Question 4

A restaurant manager is considering changing the secret sauce on their hamburgers. To decide which recipe to use, she recruits 15 customers and assigns 5 different customers to each of the 3 sauce groups (A, B, or C). She then serves them a plain hamburger with the sauce for their group and asks them to rate their satisfaction with the taste of the sauce on a scale from 1 (disgusting) to 5 (delicious) to see if there is a significant (α = .05) difference in taste. Based on the data and results below, what is the decision and conclusion for this Analysis of Variance? HINT: SS for Group A = 2.8, SS for Group B = 5.2, SS for Group C = 4.
A B C
1 3 3
2 4 5
1 2 4
3 1 3
2 2 5

Practice by placing your calculations in a table like this:

Group of answer choices

6.467 Reject the null hypothesis; results suggest there is a significant difference in taste among the three sauces

6.467 Reject the null hypothesis; results suggest there is not a significant difference in taste among the three sauces.

6.467 Fail to reject the null hypothesis; results suggest there is not a significant difference in taste among the three sauces.

1.078 Reject the null hypothesis; results suggest there is a significant difference in taste among the three sauces.

1.078 Reject the null hypothesis; results suggest there is not a significant difference in taste among the three sauces.

1.078 Fail to reject the null hypothesis; results suggest there is not a significant difference in taste among the three sauces.

4. Suppose that a perfectly competitive firm has the following total variable costs (TVC):

Quantity: 0 1 2 3 4 5 6 7 8

TVC: $0 $20 $58 $74 $88 $106 $128 $152 $178

It also has total fixed costs (TFC) of $50. If the market price is $18 per unit: a. Find the firm’s profit-maximizing quantity using the marginal revenue and marginal cost approach. b. Is the firm earning a positive profit, suffering a loss, or breaking even?

James and Katie will be auditing the revenue account for their retail client, Go Big Tires. They disagree about how to test the occurrence assertion for the revenue account. James thinks they should use Procedure A, while Katie thinks Procedure B is appropriate.

Who do you agree with, James or Katie, and why? Which assertion does the other procedure provide evidence about?

To find the resultant of multiple forces using Cartesian components and to determine the direction of this resultant from its components. As shown, three forces act on the tip of a pole. F1 = ( -60 i + 145 j + 45 k ) N. F2 = 140 N and forms the following angles with the x, y, and z axes, respectively: α = 55.2 ∘ , β = 65.6 ∘ , and γ = 135.2 ∘ . F3 = 120 N , forms the angle ϕ = 26 ∘ with the z axis, and forms the angle θ = 27 ∘ between the x axis and the projection of F3 in the xy plane.

A pension fund manager is considering three mutual funds. The first is a stock fund, the second is a long-term government and corporate bond fund, and the third is a T-bill money market fund that yields a sure rate of 4.3%. The probability distributions of the risky funds are:

The correlation between the fund returns is 0.0630.

What is the Sharpe ratio of the best feasible CAL? (Do not round intermediate calculations. Round your answer to 4 decimal places.)

What is meant by genetic variation and what are factors that contribute to genetic variation?

What is the difference between benign tumor and malignant tumor?

What are the stages (know correct sequence) of mitosis?

What is the sex chromosome combination that determines male and female gender?

What does the cell theory say?