Suppose that the population of the scores of all high school seniors that took the SAT-M (SAT Math) test this year follows a Normal Distribution with mean µ and standard deviation σ = 100. You read a report that says, “On the basis of a simple random sample of 100 high school seniors that took the SAT-M test this year, a confidence interval for µ is 512.00 ± 19.6.” If this is true, then the confidence level for this interval is: a. 90% b. 95% c. 99% d. over 99.9%

SAT reading and writing section scores of a random sample of twenty 11th-grade students in a certain high school are given below.
380 520 480 510 560 630 670 490 500 550
400 350 440 490 620 660 700 730 740 560
Test if the standard deviation of the reading and writing section SAT score of the students in this school is higher than 100. What is the value of the test statistic (round off to the nearest integer)?

In 2015, the student body of a Lock Haven University consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification.

We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. At 95% confidence, the null hypothesis

Kevin and Jenny, who are both working full-time, have three children all under the age of ten. The two youngest children, who are three and five years old, attended Eastside Pre-School for a total cost of $3,000. Ervin, who is nine, attended Big Kid Daycare after school at a cost of $2,000. Jenny has earned income of $15,000 and Kevin earns $14,000. What amount of childcare expenses should be used to determine the Child and Dependent Care Credit?

In order to estimate the average combined SAT score for students at a particular high school, a random sample of 100 students was selected and the sample mean was determined to be 870 with a sample standard deviation of 12 points.

a) Determine the error (for a 95% confidence interval) involved when trying to use the data from the sample to estimate the population.

b) Use the information in part A to help construct a 95% confidence interval estimate for the average combined SAT score for all students at the high school.

Multiple Regression: Must find a model that best fits the data: USING R

1. Test to see if x1 and x2 are highly correlated using variance inflation factor technique. What can we conclude? Is Multicollinearity present?

2. Construct scatter plot in R to visualize relationship between y and each x.

Dataset:

Y= Time

X1= School

X2=District

"School" "District" "Time"

1,3,4

2,6,7

18,9,24

4,10,114

9, 2, 16

Imagine two physicians who practice their profession in cities with identical demand for their services. Their marginal costs of providing medical services are also identical. During their medical school years, however, there was a difference between them. While Physician A received a full scholarship to attend medical school, Physician B had to pay full tuition. According to economic theory, should physician B charge a lower price than physician A for her services, the same price, or a higher price? Justify your answer.

A school that opened with 1500 students in the year 2000 was expected to grow at a rate of p'(t)= 150/ √(1+.2t), where p(t) represents the total school population t years after 2000. What was the expected enrollment in 2005.

I got p(t) to be 1500√u and I can't find out how to get C. If someone could make sure I have the right p(t) and explain how to get C, that would be great.

You own a construction company and have recently received a contract with the local school district to refurbish one of its elementary schools. You are given an up-front payment from the school district in the amount of $5 million. The contract terms extend from years 2018 to 2020. When would you recognize revenue for this payment?

• What method of accounting would you use for this construction project and why?
• What would be the benefits and challenges with your method selection?

In 2015, the student body of Lock Haven University consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classification.

We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. The calculated value for the test statistic equals?