A researcher would like to know if a vegan diet will lower cholesterol.  A sample of n = 9 adults is obtained, and each has their cholesterol levels measured.  Each participant then goes on a strict vegan diet for the next 45 days and cholesterol levels are measured again after that.  Average total cholesterol dropped by MD = 14 points after the vegan diet with SS = 1152 for the difference scores. Which of the following is the best statement of HO? What is the critical value of t for two tailed, alpha 0.05? What is the sample variance? Report a number to one decimal.

Q: A sample of n = 9 scores has a mean of M = 20. One of the scores is changed and the new mean is…

A: The formula of the mean : Mean= sum of observationsnumber of observationssum of observations = meanM…

Q: If there were 760 students in Jamal’s class, approximately how many students scored higher than…

A: The probability that z-score is greater than 1.41 is calculated as follows: PZ>1.41=1-PZ≤1.41…

Q: Dr. Doofenshmirtz is interested to know how his latest evil invention, the Evil-inator, influences…

A: we know, Correlated Groups t-test: Correlated or paired t-tests are of a dependent type, compares…

Q: A sample has a mean of 30 and s=8 would a score of x=36 be considered a central score or an extreme…

A: The z-score for x=36 when mean of 30 and standard deviation of 8 is, z=x-Means=36-308=68=0.75 It is…

Q: In a one-tail test, the p-value is found to be equal to 0.0026. If the test had been two-tailed, the…

A:

Q: A sample of n = 4 scores has a mean of x̅ = 40, with a sum of squares of SS = 48. What is the…

A: Given that n=4, x̅ = 40 and SS=48 Consider, the variance, s2=SSn-1=484-1=16

Q: Which of the following would lead to the best comparative exam score? a. x= 65, µ=60 and the σ=2 b.…

A:

Q: The manager wants to rank the five employees based on performance with number of errors weighted…

A: Note: As per the guidelines, in case of multiple questions, answer to the first question will be…

Q: A child dying from an accidental poisoning is a terrible incident. Is it more likely that male child…

A: From the provided information, Sample size (n) = 1830 Male (x) = 1031 Level of significance (α) =…

Q: In most research, what does the p-value have to be for results to be considered statistically…

A: Here we want to know correct option.

Q: A sample of n = 81 scores is obtained from a population with µ = 80 and σ = 27. If the sample mean…

A: Given that, Sample size, n = 81 Z score = +2.33 μ=80 and σ=27

Q: If the score of 3 courses for a student who studied at a university are 81, 62, 74 with credit hours…

A:

Q: One sample of n=10 scores has a mean of 8 and a second sample of n= 5 scores has a mean of 2. if the…

A:

Q: In 2008, a highway safety administration reported that the number of pedestrian fatalities in City A…

A:

Q: 6 of the last 10 sundaes sold had nuts. Considering this data, how many of the next 5 sundaes sold…

A: The probability that sundaes sold had nuts is, Psold sundaes have nuts=610=0.6 The probability that…

Q: An Ectopic Pregnancy is twice as likely to develop when the pregnant women is a smoker as it is when…

A: The aim is to get the percentage of women having ectopic pregnancy are smoker.Let A be the event…

Q: A researcher knows from decades of past research that scores on IQ tests have an average μ = 100.…

A: The given information is that a researcher knows from decades of past research that scores an IQ…

Q: On a psychology exam withµ= 76 and o = 12, Tom scored 9 points below the mean, Mary had a score of X…

A: From the provided information, Mean (µ) = 76 Standard deviation (σ) = 12 X~N (76, 12)

Q: A cognitive psychologist working in the area of suggestion asked a sample of children to solve as…

A: c)The degree of freedom=n1+n2-2=7+7-2=12   Then, at α=0.05, the critical value of t is 1.782.

Q: On a stats exam with μ = 82 and σ = 10, Student A scored 7 points below the mean, Student B had a…

A: Given Data: z-score of student A=(-7/10)=-0.7 z-score of student B=(85-82)/10=0.3 z-score of student…

Q: A population has a stand. dev. of 24. on average, how much difference should there be between the…

A:

Q: Two doctors asked 6 of their patients, who were smokers, how many years they had smoked. In…

A: Correlation coefficient: Correlation coefficient measures the strength and direction of linear…

Q: The value of the third quartile for a data set is 65. This means that: O 25% of the values in that…

A: Given that, The value of the third quartile for a data set is 65.

Q: On a psychology exam with µ = 76 and o = 12, Tom scored 9 points below the mean (M), Mary %3D had a…

A: Given, On a psychology exam with μ =76 and σ=12, Tom scored 9 points below the mean(M), Mary had a…

Q: If the data is weight, the z-score for someone who is overweight would be what?? if the data is…

A: Also known as standard score, z-scores are a way to compare two scores that may or may not be from…

Q: For a population with µ = 84 and σ = 4, what is the z-score corresponding to X = 80?

A: From the given information,   Mean = 84 Standard deviation = 4   The objective is to find the…

Q: If the z-score for a motel is 0.7, what is the price of a single room at the motel (in dollars)?

A: The formula for z score is, z=x-μσn In the formula, x is the individual score, μ is the mean, σ is…

Q: Two doctors asked 6 of their patients, who were smokers, how many years they had smoked. In…

A: Given, Two doctors asked 6 of their patients, who were smokers, how many years they had smoked. In…

Q: The absolute value for the difference between the two ladies z-score is

A: Let , X→N(μ=15.7 , σ=7.43) Since , the Rena's score on the exam is 9 and Sara's score was 25. We…

Q: A sample of n equals 20 scores is transformed into z-scores what is the meaning for the set of 20…

A:

Q: How do I solve c, d, and e with the given data?

A: From the given box plot we find the solution for C,d,e.

Q: Two types of medical devices used for knee replacement are being studied to see if the type of knee…

A: Given, The infection rate for a specific bacterial infection after surgery for device A is 0.0043.…

Q: A sample of 9 freshmen takes a reading comprehension test and their scores are a mean of 10 and…

A: Consider that μ defines the population mean score.

Q: If a person’s z score equals 2.08, what is their percentile?

A: Given info: The person’s z score equals 2.08.

Q: Two horses A and B were tested according to the time (in seconds) to run a particulat track with the…

A:

Q: The claim is that the proportion of peas with yellow pods is equal to 0.25 or 25% the sample…

A:

Q: show had an AQH rating of 12.0 among Men and 15.0 among Women. If Women constituted ercent of the…

A:

Q: Gyuri performed an analysis of Simvastatin tablets. The following are the data she obtained: 39.5…

A: Given that, Gyuri performed an analysis of Simvastatin tablets and the following are the data she…

Q: In a random sample of college freshmen, the proportion who use text messaging daily was 0.93. In a…

A: Given, In a random sample of college freshmen, the proportion who use text messaging daily was 0.93…

Q: If a constant c is added to each xi in a sample, yielding y; = x; + c, how do the sample mean and…

A: Note:-Since you have asked multiple questions, we will solve the first question for you. If you want…

Q: recent poll showed that 61% of adult Americans are comfortable with the legalization of marijuana,…

A: A recent poll showed that 61% of adults Americans are comfortable with the legalization of…

Q: If CV for an English Test is 62.5% and the CV for a History test is 62.5% , Compare the variation of…

A:

Q: The head of a computer science department is interested in estimating the proportion of students…

A: Solution: From the given information, confidence level is 0.95, p=0.35 and E=0.10.

Q: A set of n = 10 pairs of scores has ΣX = 20, ΣY = 30, and ΣXY = 74. What is the value of SP for…

A: It is given that ΣX = 20, ΣY = 30, and ΣXY = 74.

Q: On average, a sample of n = 36 scores will provide a better estimate of the population mean than a…

A: We have to identify trueness of statement.

Q: A student scored between 81% and 93% on all exams except for one that she failed with a47% because…

A: Given that the student failed in one exam with score 47% In all other exams the student scored 81%…

Q: When an airline sells tickets for a flight, only about 90% of people who buy a ticket actually show…

A: a) The 95% confidence interval for the sample proportion is obtained below: The proportion p =0.60…

Q: On a psychological test with H = 88 and o = 12 , Carlo scores 8 points below the mean, Nick had a…

A:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.