Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will be a​ girl, but assume that the method has no​ effect, so the probability of a girl is 0.5. Assume that the groups consist of 36 couples. Complete parts​ (a) through​ (c) below.

a. Find the mean and the standard deviation for the numbers of girls in groups of 36 births.

The value of the mean is__ ​(Type an integer or a decimal. Do not​ round.)

The value of the standard deviation is __. ​(Round to one decimal place as​ needed.)

b. Use the range rule of thumb to find the values separating results that are significantly low or significantly high.

Values of ___ girls or fewer are significantly low. ​(Round to one decimal place as​ needed.)

Values of ___ girls or greater are significantly high. (Round to one decimal place as​ needed.)

c. Is the result of 32 girls a result that is significantly​ high? What does it suggest about the effectiveness of the​ method?

The result is/is not significantly​ high, because 32 girls is greater than/equal to/less than ___ girls. A result of 32 girls would suggest that the method is not effective/is effective.​(Round to one decimal place as​ needed.)

Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will be a​ girl, but assume that the method has no​ effect, so the probability of a girl is 0.5. Assume that the groups consist of 26 couples. Complete parts​ (a) through​ (c) below. a. Find the mean and the standard deviation for the numbers of girls in groups of 26 births. The value of the mean is muequals nothing. ​(Type an integer or a decimal. Do not​ round.) The value of the standard deviation is sigmaequals nothing. ​(Round to one decimal place as​ needed.) b. Use the range rule of thumb to find the values separating results that are significantly low or significantly high. Values of nothing girls or fewer are significantly low. ​(Round to one decimal place as​ needed.) Values of nothing girls or greater are significantly high. ​(Round to one decimal place as​ needed.) c. Is the result of 23 girls a result that is significantly​ high? What does it suggest about the effectiveness of the​ method? The result ▼ is not is significantly​ high, because 23 girls is ▼ less than equal to greater than nothing girls. A result of 23 girls would suggest that the method ▼ is effective. is not effective. ​(Round to one decimal place as​ needed.)

Automatic versus Manual Processing
Mid-Town Copy Service processes 2,200,000 photocopies per month at its mid-town service center. Approximately 60 percent of the photocopies require collating. Collating is currently performed by high school and college students who are paid $9 per hour. Each student collates an average of 5,000 copies per hour. Management is contemplating the lease of an automatic collating machine that has a monthly capacity of 5,000,000 photocopies, with lease and operating costs totaling $1,384, plus $0.07 per 1,000 units collated.

(a) Determine the total costs of collating 500,000 and 1,400,000 per month:

1. With student help:

   500,000
   1,400,000

   1. With the collating machine:

      500,000
      1,400,000

(b) Determine the monthly volume at which the automatic process becomes preferable to the manual process.
Answer

copies.

(c) Should Mid-Town Copy lease the automatic collating machine at this time?

Midtown should lease the collating machine only if the monthly volume is less than 800,000 copies.

Given the current cost structure Midtown should not lease the collating machine regardless of the monthly volume.

Midtown should only lease the collating machine if the monthly volume is more than 500,000 copies.

Midtown should lease the collating machine at the current monthly volume.

What is the meaning of privatization and neoliberalism in Latin America

Why was Latin America so inflation prone?

The ideas of Raul Prebisch and Albert Hirschman encouraged the import substitution industrialization strategy in Latin America in the 1950s and the 1960s. Explain why Prebisch and Hirschman encouraged this strategy. What were the major features of the strategies and what kinds of negative effects were experienced? How does the industrialization experience in Latin America compare to that in the U.S. Midwest? What was the role of agriculture in each?

A pediatrician randomly selected 50 six-month-old boys from her practice's database and recorded an average weight of 15.6 pounds with a standard deviation of 0.45 pounds. She also recorded an average length of 25.7 inches with a standard deviation of 0.27 inches.

(a) Find a 95% confidence interval for the average weight (in pounds) of all six-month-old boys. (Round your answers to two decimal places.)_____ lb to______ lb

(b) Find a 99% confidence interval for the average length (in inches) of all six-month-old boys. (Round your answers to two decimal places.) in ____ to ______in

(c) What do you have to assume about the pediatrician's database in order to make inferences about all six-month-old boys?

1. The pediatrician's database must contain all measurements from the entire population of six-month old boys.

2. The pediatrician's database must be updated daily.

3. The pediatrician's database must produce intervals that contain the respective sample means.

4. The pediatrician's database must be kept secure using state of the art security software.

5. The pediatrician's database must be representative of the entire population of six-month old boys.

The authors of the paper "Age and Violent Content Labels Make Video Games Forbidden Fruits for Youth" carried out an experiment to determine if restrictive labels on video games actually increased the attractiveness of the game for young game players.† Participants read a description of a new video game and were asked how much they wanted to play the game. The description also included an age rating. Some participants read the description with an age restrictive label of 7+, indicating that the game was not appropriate for children under the age of 7. Others read the same description, but with an age restrictive label of 12+, 16+, or 18+.

The data below for 12- to 13-year-old boys are fictitious, but are consistent with summary statistics given in the paper. (The sample sizes in the actual experiment were larger.) For purposes of this exercise, you can assume that the boys were assigned at random to one of the four age label treatments (7+, 12+, 16+, and 18+). Data shown are the boys' ratings of how much they wanted to play the game on a scale of 1 to 10.

Do the data provide convincing evidence that the mean rating associated with the game description by 12- to 13-year-old boys is not the same for all four restrictive rating labels? Test the appropriate hypotheses using a significance level of 0.05.

A. Calculate the test statistic. (Round your answer to two decimal places.)   F =

B. What can be said about the P-value for this test?

P-value > 0.1000
.050 < P-value < 0.100   
0.010 < P-value < 0.0500
.001 < P-value < 0.010
P-value < 0.001

C.
Reject H₀. The data do not provide convincing evidence that the mean rating associated with the game description by 12- to 13-year-old boys is not the same for all four restrictive rating labels.
Reject H₀. The data provide convincing evidence that the mean rating associated with the game description by 12- to 13-year-old boys is not the same for all four restrictive rating labels.    
Fail to reject H₀. The data do not provide convincing evidence that the mean rating associated with the game description by 12- to 13-year-old boys is not the same for all four restrictive rating labels.
Fail to reject H₀. The data provide convincing evidence that the mean rating associated with the game description by 12- to 13-year-old boys is not the same for all four restrictive rating labels.

Seventy-five percent of the students graduating from high school in a small Iowa farm town attend college. The towns chamber of commerce randomly selects 30 recent graduates and inquires whether or not they will attend college.

A) find the probability that at least 80% of the surveyed students will be attending college.

B) find the probability that at most 70% of the surveyed students will be attending college.

C) find the probability that between 65% and 85% of the surveyed students will be attending college.

D) why might the data gathered from this sample misestimate the proportion of students who will actually be attending college.

In the movie “A Beautiful Mind” there is a scene in which John Nash (Russell Crowe) and his friends are in a Pub and a group of girls walked into the place. At that point, Nash associated getting to meet the girls with game theory under oligopoly competition. If Nash and his friends are oligopolistic firms and the girls are consumers, use economic terms to translate the scene in terms of competition for an oligopoly market.