A college administrator wants to learn about the mean SAT score of students who attend math tutoring services. To do this she will collect data to make a 90% confidence interval about the mean SAT score of such students. She takes a random sample of 9 SAT scores of students who attend math tutoring services. The scores are as follows. 1050, 940, 1200, 1300, 1150, 860, 920, 1000, 900. Find the mean of the scores and standard deviation of the scores in the sample. Determine the critical value Tc corresponding to a 90% confidence interval. Compute the margin or error, E. Give a 90% confidence interval about the mean, µ.

Q: To test the intelligence of 10th class boys and girls in a Higher Secondary School, a sample of 83…

A: We have given that  Sample size n1=95 , n2=83 Sample mean xbar1 =29.91  xbar2 =40.92 Standard…

Q: The sample of five companies in the aerospace industry was surveyed as to their return on investment…

A:

Q: With the aid of a table, find the sample Standard Deviation of the following dataset: X = {2.2, 4.7,…

A:

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A: From the given information, The first sample shows the SAT math test scores whose parents are…

Q: The top 15 2018 Congressional race contenders (out of 24) in NJ who raised the most money reported…

A: Given data: 7.0, 1.2, 6.4, 5.4, 2.1, 4.4, 2.9, 2.3, 1.75, 1.6, 1.5, 1.5, 1.4, 1.1, 0.8.

Q: The following sample data are from a normal population: 10, 8, 12, 15, 13, 11, 6, 5. What is the…

A: Given data is10,8,12,15,13,11,6,5sample size(n)=8sample mean(x¯)=10standard…

Q: Twenty-five percent of commercial airline accidents are caused by bad weather. If 300 commercial…

A: The mean of the binomial random variable obtained by the formula μ=np, where (n) is the number of…

Q: For a distribution Bowley's coefficient of skewness is - 0.56, Q = 16.4 and median = 24.2. What is…

A:

Q: A reading specialist wanted to estimate the mean word length, in number of letters, for an…

A: Given data Sample size ,n=100 Sample mean  x ̅  =4.9 letters Sample SD , s=0.15 letters

Q: A psychologist wanted to know if students in her class were more likely to cheat if they were low…

A: A descriptive statistic is a summary statistic that quantitatively describes or summarizes features…

Q: The principal randomly selected six students to take an aptitude test. Their scores were:…

A: The sample mean and standard deviation are, The degree of freedom is, df=n-1   =6-1   =5

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A:

Q: A simple random sample of 28 observations was taken from a large population. The sample mean equaled…

A: It is given that, a simple random sample of 28 observations was taken from a large population with…

Q: The president of an all-female school wants to know if the students at her school studied more or…

A: Given: The information is provided of School of all female and all male. The provided data is:…

Q: The daily salaries of security guards for 10 security agencies are as follows: P350, P400, P375,…

A: Solution To find the point estimate we will find the sample mean.

Q: In a study of Ridge View's boys' basketball team, the average height is 68 inches and standard…

A: Given, mean =μ=68Standard deviation = 4x = 78

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A: We are given two independent samples here  1) SAT math test scores for students whose parents are…

Q: A psychologist wanted to know if students in her class were more likely to cheat if they were low…

A: Given information: The data represents the ratings of cheating for three achievement group.

Q: Due to recent trends in the childcare industry, the firm suspects that the that the mean annual…

A: Solution: Given information: n1=20 Sample size of Illinoisn2= 20 Sample size of…

Q: The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range,…

A: We have to calculate some summary statistics for given data.

Q: The annual earnings​ (in dollars) of 35 randomly selected microbiologists are shown in the data…

A: Given data of 35 randomly selected microbiologists annual earnings as shown belowThe Sample mean is…

Q: The two-way table represents the results of a random survey taken to determine the preferred vehicle…

A:

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A: Given data represents the SAT math test scores for a sample of students whose parents are college…

Q: Among the first-year resident students, eight students were randomly selected, and their body…

A: Given: weight at the beginning of the semester (X) End of term weight (Y) 45 52 61 65 62 64…

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A: Given,

Q: Assume the managers have requested estimates of the mean attitudes towards each mall with a margin…

A: M.E= 0.05 Springdale Mean -3.81 Springdale STDEV - 1.06 West Mall Mean - 3.41 West Mall STDEV - 1.18…

Q: A bookstore found out that 23 percent of their customers buy a book, 34 percent of their customers…

A:

Q: A simple random sample of 41 Veterans Day celebrations was selected and the number of children…

A: (14) Obtain the 98% confidence interval for the mean number of children attending all 2017 Veterans…

Q: The following dataset shows the AP History scores of 10 students: 3, 4, 3, 2, 3, 5, 2, 4, 1, 2 a)…

A: We have given that  Data : 3, 4, 3, 2, 3, 5, 2, 4, 1, 2 Sample size n = 10 I want to find mean and…

Q: The following data set represents performance scores from a sample of participants in a psychology…

A: The formula to find sample standard deviation is as follows,  s = ∑ x2-∑x2nn-1

Q: The state Government gives grants to low-income undergraduate students. According to the National…

A: The given hypotheses are as follows: H0: µ = 2,600. Ha: µ ≠ 2,600. The sample size is 50 students,…

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

A:

Q: The manager of a fast-food restaurant selected several cash register receipts at random. The amounts…

A: Given data values are 12, 15, 16, 10 and 27. a. Range: Range=Maximum value-Minimum value…

Q: 10)The superintendent of a golf course believes that the mean score for professional golfers on his…

A: We have to find confidence interval for population mean. Since population standard deviation () now…

Q: Previously, an organization reported that teenagers spend 8.5 hours per week, on average, on the…

A: Given information: The data represents the number of hours per week teenagers spend on the phone.

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A: Introduction: Denote μ1, μ2 are the population mean SAT math scores of students whose parents are…

Q: b. In the year 2000, a survey of 1171 U.S. adults were asked who they felt was the greatest…

A:

Q: how many subjects are needed to estimate the mean number of books read the previous year with six…

A: It is given that confidence level is 0.90, standard deviation is 11.3 and margin of error E is 6.

Q: The principal randomly selected six students to take an aptitude test. Their scores were: 88.0 84.1…

A: Solution: Let X be the score. The given data is 88, 84.1, 74.9, 83.2, 83.7 and 85.5.

Q: The principal randomly selected six students to take an aptitude test. Their scores were 72.3 81.1…

A: Data given: 72.3, 81.1, 78.4, 80.9, 81.5, 75.5  Calculate mean: mean=72.3+81.1+78.4+80.9+81.5+75.5…

Q: NebNas manages the credit department for a grocery store chain in the province, and she would like…

A: From the given information, n=100x¯=101.5s=25.6μ=95 Given claim is the mean balance is different…

Q: The ages in years of a random sample of shoppers at a gaming store are shown. Determine the range,…

A:

Q: The principal randomly selected six students to take an aptitude test. Their scores were: 88.0 84.1…

A: Given, Scores: 88.0, 84.1, 74.9, 83.2, 83.7, 85.5  Sample Size (n) =6

Q: Determine the point estimate, p and the sample standard deviation, S5.

A: here n = 439 x= 162 here x= no of students working full time while going to school

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A: (a) Let μ1 is the population mean verbal score of students whose parents are college graduates with…

Q: The following data are the marks for a sample of 5 students in Mathematics Exam. 19, 11, 21, 23, 18…

A:

Q: Average Senior High School annual cost of tuition fee for all private school last year was P46,300.…

A: A random sample of 45 private schools; n=45 The sample mean was 47800 and sample standard deviation…

Q: The following is the number of hours of sleep obtained by eight college freshmen.  Use the data to…

A: The data set is: 7.5 8 6.5 24 8.5 6.5 7 7.5

Q: The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest…

A:

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.