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.

Could be there any potential for changes in honey composition due topesticides ? Does subject ing bees to pesticides, along with any compounds to help bees express detoxifying substances?

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. Perform the linear regression. Explain your results in terms of the hypotheses. (no need to write equation)
   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.

Discuss and provide details of the major evolutionary changes associated with the ergaster/erectus group. Be sure to include all details that allow you to place them in the evolutionary and fossil record.

Use average bond energies to estimate the enthalpy changes of the following reactions: a. N2(g) + 3 H2(g) -> 2 NH3(g) b. N2(g) + 2 H2(g) -> H2NNH2(g) c. 2 N2(g) + O2(g) -> 2 N2O(g)

In a machine that temperature changes from 20 ∘C up to 120 ∘C a tungsten wire filament 13.0 cm long with a diameter of 1.20 mm will be used. The wire will carry  11.0 A at all temperatures ( Resistivity of tungsten at 20 ∘C is 5.25×10^−8Ω⋅m , the temperature coefficient of resistivity at 20 ∘C is 0.0045 ∘C^−1 ).

A-)Calculate the maximum electric field in this filament?

B-)Calculate the resistance of the filament  with that field?

C-)Calculate the maximum potential drop over the full length of the filament?

Reflect on how financing (taking a loan for your assets) changes the picture on your financial statements

Reflect on how your customer paying or not paying you promptly has an effect on your financial statements.

Write a paragraph or two about how doing the bookkeeping and accounting for a company gives you insight into the company.

Discuss how prosperity and advances in science in the 1945-69 time period led to changes in medical care and the medical profession in the country? How does science shape health policy today?

1. Assume the price of Super Bowl Tickets increases by 20% and the quantity demanded changes by 2%.
a. What is the price elasticity of demand for Super Bowl Tickets?
b. Is it elastic, inelastic, or unit elastic?

2. When the price of Lays Potato chips decreases by 5%, the quantity demanded for them changes by 15%.
a. What is the price elasticity of demand for Lays Potato Chips?
b. Is it elastic, inelastic, or unit elastic?

3. Assume demand for a Snickers bar is unit elastic. If the price of a Snickers bar were to increase by 4%, what would happen to the quantity demanded?

4. On the way to work you notice the price of gasoline is $3.25 per gallon. At that price the gas station sells 1000 gallons per hour. On the way home, you notice the price of gasoline has risen to $4.00 per gallon, and at that price the gas station sells 950 gallons per hour.
a. What is the price elasticity of demand for gasoline?

5. Suppose you work for the college bookstore. The current price of a GSU t-shirt is $15, and the bookstore normally sells 200 per week. The elasticity of demand for t-shirts is estimated to be 0.75. In an attempt to raise revenue, the bookstore is considering raising the price to $16.50, a 10% increase.
a. By how much will quantity demanded change for GSU t-shirts?

Exchange rate risk:

The value of currencies changes every minute. Over a month, or indeed a year, the value of a currency can change enormously. This represents an exchange rate risk to exporters and importers, and can have important implications for a company profits.

Use a numerical example to explain how large firms protect themselves from exchange rate risks.