A medical researcher believes that a drug changes the body's temperature. Seven test subjects are randomly selected and the body temperature of each is measured. The subjects are then given the drug, and after 30 minutes, the body temperature of each is measured again. The results are listed in the table below. Is there enough evidence to conclude that the drug changes the body's temperature? Let d=(body temperature after taking drug)−(body temperature before taking drug) d=(body temperature after taking drug)−(body temperature before taking drug) . Use a significance level of α=0.02 for the test. Assume that the body temperatures are normally distributed for the population of people both before and after taking the drug.

Temperature (before) 100.2 100.2 100.4 100.4 99.6 99.6 98.8 98.8 98.8 98.8 100.3 100.3 100.7 100.7

Temperature (after) 99.4 99.4 99.7 99.7 100.2 100.2 98.2 98.2 98.5 98.5 99.6 99.6 100.3 100.3

Step 3 of 5 : Compute the value of the test statistic. Round your answer to three decimal places.

1. 23.38 Football and brain changes. American football is a contact sport that can expose players to repeated head impacts. While most impacts do not lead to a medically diagnosed concussion, an increasing body of evidence suggests that repetitive subconcussive head trauma can also result in neurocognitive deficits. Researchers recruited young football players (mean age, 12 years old). The players wore sensor-equipped helmets during all practice and game events for an entire football season to record subconcussion exposure (computed as an index value on a scale of 0 to 1). Each player also received a magnetic resonance imaging (MRI) scan at the beginning and at the end of the football season to measure changes in the brain white matter tract (computed as a percent of the original white matter volume). Here are the findings for 22 players:¹⁴

   Exposure	Change	Exposure	Change
   0.89	− 6.1	0.33	1.8
   0.05	0.0	0.11	1.9
   0.35	0.2	0.36	2.2
   0.37	− 1.2	0.08	2.3
   0.11	6.3	0.10	− 3.0
   0.19	− 4.6	0.06	8.4
   0.10	1.1	0.34	− 2.7
   0.45	1.3	0.12	3.0
   0.23	6.9	0.14	− 2.2
   0.46	1.7	0.21	− 1.4
   0.10	− 3.6	0.20	0.7

   1. Create a scatterplot of white matter change and subconcussion exposure, using subconcussion exposure as the explanatory variable. Describe the pattern.
   2. The researchers performed a linear regression analysis on the data. What is the equation for the least-squares regression line? What is the regression standard error? Test the null hypothesis of no relationship between subconcussion exposure and white matter change.
   3. One player had an unusually large subconcussion exposure. Obtain the equation for the least-squares regression line without this data point and test the null hypothesis of no relationship between subconcussion exposure and white matter change. What is the regression standard error?
   4. Use your work to describe the impact of the unusual observation on the regression analysis.

AssignmentDescription: The commercial banking industry is undergoing rapid changes due to advances in technology and competitive pressures in the financial services sector. The data file Bankscontains selected information tabulated by Fortune concerning the revenues, profitability, and number of employees for the 51 largest U.S. commercial banks in terms of revenues.Instructions: Use the information in this file to complete the following:PartInstructionsPoints Possible1Start Excel. Open the downloaded Excel file named Banks.xlsx, and then save the file as Assignment5_LastFirst.02Compute the mean, median, and standard deviation for the three variables revenues, profits, and number of employees. Assume this data is defined as a population.153Convert the data for each variable to a z value. Consider Mellon Bank Corporation headquartered in Pittsburgh. How does it compare to the average bank in the study on the three variables? Discuss.154As you can see by examining the data and by looking at the statistics computed in part a, not all banks had the same revenue, same profit, or the same number of employees. Which variable had the greatest relative variation among the banks in the study?155Calculate a new variable: profits per employee. Develop a frequency distribution and a histogram for this new variable. Also compute the mean, median, and standard deviation for the new variable. Write a short report that describes the profits per employee for the banks.406Referring to Question 5, how many banks had a profit-per-employee ratio that exceeded 2 standard deviations from the mean?157Save the workbook. Close the workbook and then exit Excel. Submit the workbook as directe

Based on the essay "Killing the I Bank", describe how changes in technology and market practice are affecting . . .

                a.     Underwriting of shares.

                b.     Mergers & Acquisitions

The adoption of digital technologies has introduced drastic changes into the business environment, including which of the following?

What is the key point of revenue recognition?

Accounts Receivable should be reported in the balance sheet at which of the following?

At December 31, the balance in Newton Company’s allowance for uncollectible accounts had a debit balance, before adjustment, of $1,400. Newton uses the balance statement approach to estimate bad debts expense and determined that the balance of the allowance at year end should be $3.400. What adjusting entry does Newton need to make to record bad debts expense for the year?

When the LIFO method of costing inventory is in use, the seller:

Use a graph to illustrate how the following changes would affect the demand curve for inpatient hospital services at a hospital in a large city.

a) The Government decided to lower the taxes on inpatient hospital services.” Explain. (5 points)

b) Food and Drug Administration makes the following declaration: “From now on, pharmacists can prescribe and sell all types of prescription drugs.” Explain! (5 points)

c) The price of magnetic resonance imaging (MIR) declined by 90% due to a new technological innovation; the cross-price elasticity of demand between MRI services and inpatient hospital services is -0.687. Explain. (5 points)

Briefly describe how the coronavirus has led to the changes in the economy over time, relating it to levels of shut down over time in the states.

A study of undergraduate computer science students examined changes in major after the first year. The study examined the fates of 256 students who enrolled as first-year students in the same fall semester. The students were classified according to gender and their declared major at the beginning of the second year. For convenience we use the labels CS for computer science majors, EO for engineering and other science majors, and O for other majors. The mean SAT mathematics scores for the students are summarized in the following table. Major Gender CS EO O Males 628 618 589 Females 582 631 543 Summarize the results of this study using appropriate plots and calculations to describe the main effects and interaction.