A local business offers test-taking courses for students who are planning to take the Graduate Record Examination (GRE) as part of their graduate school applications. The business promises to produce student test scores that are above the national average. You collect a random sample of 75 local students who have taken the course and calculate that their average GRE score is 1630 with a standard deviation of 320. The average GRE score for all students in the nation is 1590. Conduct a significance test at a=.05 to answer the research question: Does the course significantly improve local student GRE scores? What is your obtained score? Should you reject the null or fail to reject the null based on if the program is working or not?

Q: Use the sample mean(78.5)and sample standard deviation (12.3671)in your calculations below. Use…

A: Given that:

Q: Public health statistics indicate that 26% of  American adults smoke cigarettes. A random sample of…

A:

Q: Would a person spending $476 on their car be considered usual or unusual if the amount spent by the…

A: Given information- Population mean µ = $347 Population standard deviation, σ = $39.58 Let, X be the…

Q: Find the 30th percentile of the blood pressures. Find the 67th percentile of the blood pressures.…

A: Consider a random variable X which represents the diastolic blood pressures of adult women in the…

Q: sports analytics firm would like to test whether Kyrie Irving’s points per game is different from…

A: Sample size=19

Q: Calculate the mean, standard deviation, and variance for the following five scores: 9, 4, 7, 1, 4.

A: Considering the scores as population. The population mean is, μ=∑XN=9+4+7+1+45=255=5 Thus, the…

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

Q: Use the sample mean(78.5)and sample standard deviation (12.3671)in your calculations below. Use…

A: Given that:

Q: A teacher found that the mean number of hours her 12 students spent studying for an AP Statistics…

A: old mean for 12 students = 6.7 sum of 12 students = 6.7*12 = 80.4

Q: Matthew made the "Reach for the Top" trivia team because he consistently gave the correct answers in…

A: Let, Matthew made the "Reach for the Top" trivia team because he consistently gave the correct…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: A car salesperson offers you a car at the price of $22,895. You look up the mean sales price for…

A: We have given that the random variable X that is sales price. Here, X = 22895 Mean = 21900 and…

Q: The temperature is recorded at 80 airports in the region. The average temperature is 65 degrees…

A: Solution

Q: Identify the population(s). Average number of Americans who consume alcohol. All individuals who…

A: Parameter: Parameter may be defined as which one is based on population

Q: A Population has a Mean of 90 and a standard deviation of 25.  A sample of 20 college students is…

A:

Q: On the past math summative exam the bottom 20% of students failed to pass the test.the mean for the…

A:

Q: Kelsey Matthau is an advisor for a high school. The high school offers a class for students…

A: The Given hypothesis test for the difference between two means of independent samples is…

Q: If a researcher were to increase a sample size from n = 30 participants to n = 80 participants, what…

A: Increase power

Q: Three potential employees took an aptitude test. Each person took a different version of the test.…

A: The z-score will be used to answer the given question. The formula for the z-score is z=x-μσ that…

Q: The population average GPA for fall students is 3.00. You think the average GPA for Psychology…

A: The test statistic for single mean is, t=x¯-μ0snwherex¯=sample means=sample standard…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: Use the sample mean(78.5)and sample standard deviation (12.3671)in your calculations below. Use…

A: Given information:

Q: The mean of a test score was 21.2 and the standard deviation was 5.1 . Identify the rest scores that…

A: Given Data Mean µ= 21.2. Standard Deviation σ= 5.1. Assuming that the given data is obtained from a…

Q: Explain the term "deviation scores"?

A:

Q: Sarah​'sscore on the Stats midterm was 81 points. The class average was 76 and the standard…

A: Given that  Mean = 76 SD = 5 And the Sarah's score is X = 81

Q: On a nationwide math test, the mean was 51 and the standard deviation was 4. If Roberto scored 85,…

A: We have given the mean and standard deviation of a nationwide math test.Mean μ = 51Standard…

Q: On a nationwide math test, the mean was 72 and the standard deviation was 7. If Roberto scored 90,…

A: Given that, Mean = 72 Standard deviation = 7

Q: student scored in the 75th percentile on the SAT. What does that mean?

A:

Q: Tony decided that he wants to pursue a master degree in business. One of the requirement is the GMAT…

A: Given that  Tony's GMAT = X = 730 Mean = 556 , Standard deviation = 116

Q: 5 points on his st. The mean was 70 standard deviation atively better on thein

A:

Q: Newborn babies: A study conducted by the Center for Population Economics at the University of…

A: Z = (x - u) /s u = mean = 3492 s = standard deviation = 872

Q: Song length varies from genre to genre. Brian wonders if there is a difference in the length of…

A: Answer:- Given, For Country songs  Sample size, n1 = 50 , Sample mean ,X̄1 = 3.44 minutes and…

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: Given information- Population mean, µ = $45,000 Population standard deviation, σ = $6,200 Sample…

Q: The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances…

A:

Q: Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest…

A:

Q: Six different​ second-year medical students at Bellevue Hospital measured the blood pressure of the…

A: Given 126,138,132,138,124,122

Q: A group of customer service surveys were sent out at random. The scores were 40, 70, 80, 00, 50, 40,…

A:

Q: uan and his family are relocating to Los Angeles. They purchased a home they really like, which cost…

A: Solution: Given information: μ= $735000  Population mean σ=$17050  Population standard deviation.

Q: high school students across the nation compete in a financial capability challenge each year by…

A: It is given that, the students who score in the top 13 percent are recognized publicly for their…

Q: Head Start is an enrichment program for young children. The program’s administrators would like to…

A: Given that,claim: Has the program increased the students’ IQs.

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.