(a) What proportion of combined GRE scores can be expected to be over 163.4? (b) What proportion of combined GRE scores can be expected to be under 160?

Q: Twenty-two different video games showing drug use were observed. The duration times of drug use ​(in…

A: Given: Sample size (n) = 22 Here, the test is conducted to check whether the population mean is…

Q: (d) Find the p-value. (Round to three or more decimal places.) (e) Is there enough evidence to…

A: For the given data P value =? Conclusion =?

Q: d. Your doctor tells you you are in the 30th percentile for blood pressure among US adults. What is…

A: We have to find score for given percentile.

Q: a. Assume that nothing is known about the percentage to be estimated. (Round up to the nearest…

A: a) If nothing is known about percentage to be estimated,  We will have a conservative estimate for…

Q: An ad for seat belts claimed that proper usage of seat belts "reduces the chance of fatality in a…

A: Correct answer is  (A)

Q: how smart are PHS students? in an attempt to answer this question, you select a random sample of 38…

A: In statistical inference, there are two types of estimation,  Point estimation and Interval…

Q: A sample with a mean of M=8 has an EZ= 56  how many scores are in the sample?   the number of…

A: Given that, Mean = M = 8 EZ= 56  n = ?   Definition of mean :  Mean is defined as sum of all…

Q: A recent study indicated that 22% of the 173 women over age 55 in the study were widows. Round up…

A:

Q: During a year the ratio of the prices of commodities A and B was 5 whereas during the next year…

A:

Q: You are told that your IQ scores falls at the 79th percentile.  What conclusion could you make about…

A: Percentiles: If the elements in the data set are arranged in ascending order of magnitude, then the…

Q: a. Roughly what percentage of z-scores are between -2 and 2? b. Roughly what percentage of z-scores…

A: Hi the question have more than 3 parts. As per the guidelines I am obliged to answer first 3 parts…

Q: Question 2: A magazine article reported that 11% of adults buy takeout food every day. A fast-food…

A:

Q: What is the scale factor of these figures?

A: We will use the scale factor formula: scale factor=new lengthold length=GHCD=1015=23

Q: In a sample of n= 6 scores, five of the scores are each above the mean by one point. Where is the…

A: The mean of a data can be obtained as follows:

Q: 1) what proportion of students scored above student 33 on homework 3? 2) what proportion of students…

A: Given:   Student ID HW 1 HW 2 HW 3 1 98 93 99 2 81 80 64 3 66 91 75.5 4 84 94 80 5 65…

Q: What percentage of the variation in  can be explained by the corresponding variations in  and  taken…

A: X1 is the dependent variable  X2 and X3 are the independent variables.

Q: b. If the study had found that 51 of the 80 students were working then: ZSTAT =| (Round your answer…

A: Given sample size, n = 80 students population proportion of working = p = 0.48 51 of the 80 students…

Q: A population of N=15 scores has £x=120. What is the population mean

A: Given, The population mean is obtained by the formula-

Q: You flip a fair coin 16 times in the air. What is the relative frequency of this coin landing on…

A: One method for making information clear and easy to understand is to structure it in a frequency…

Q: A discussion of digital ethics appears in an article. One question posed in the article is: What…

A: n = Zα/2E2p^(1-p^)

Q: A researcher wishes to estimate the proportion of corporate executives whose annual salary is over…

A:

Q: A random sample of 1012 adults in a certain large country was asked "Do you pretty much think…

A:

Q: 4. Travel to Outer Space A CBS News/New York Times poll found that 329 out of 763 randomly selected…

A: Given: x=329n=763

Q: You are testing the claim that the proportion of men who own cats is smaller than the proportion of…

A:

Q: What is the difference between the average resistance to happiness at age 20 and at age 70?

A: Given :-  R = 4.6 - 0.02x put x = 20. ⇒R=4.6 - 0.02 × 20⇒R=4.6 - 0.4⇒R=4.2 Now, put x = 70 ⇒R=4.6 -…

Q: The relative risk of developing lung cancer among individuals who smoke is 15.0. Which of the…

A: Relative risk is the ratio of probability of an outcome in an exposed group to the probability of an…

Q: Travel to Outer Space A CBS News/New York Times poll found that 329 out of 763 randomly selected…

A:

Q: show that the two formulae of the geometric mean are equal?

A: From the given information, Formula for geometric mean is given by;

Q: 4. Mr. Gomez travelled 525 km in 6 h. a) What was the mean distance travelled in 1 h? b) How is the…

A:

Q: An individual is selected from a normal population with a of μ = 80 with σ= 20, and a treatment is…

A: It is given that the mean is 80 and the standard deviation is 20.

Q: Is IQ related to GPA?If a student’s IQ is 117, what GPA would you predict?How much of the variation…

A: Given Info :  The provided data are from a random sample of thirty cases from a study by Howell…

Q: A rental car company purchased a new Toyota Camry for $35,000. The company determined this asset…

A: NOTE: Refresh your page if you can't see any equations. . The company determined this asset should…

Q: What is the formula to find the Mean?

A: The formula to find the mean as follows

Q: Referring to the table below, what is the frequency of the second class interval ?

A: The question is about frequency distribution Given :   To find : Frequency of second class interval

Q: How large a sample must she select if she desires to be 98% confident that the true mean is within 4…

A: HERE GIVEN , population standard deviation  = 6 ounces  confidence level = 98%  MOE  = 4

Q: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms…

A:

Q: A new insecticide is advertised to kill more than 95% roaches upon contact.  In a laboratory test,…

A: Given,   The sample proportion is,

Q: As shown in the table, the average number of siblings (sibs) for 1018 middle class adults is 3.15.…

A: Introduction: It is required to determine if the middle class of the country come from smaller…

Q: QUESTION 3 What percent of scores are below an SAT score of 560?

A: Mean of SAT score=mu=500 SD of SAT score=sigma=100 SAT score=x=560 Z-score=(x-mu)/sigma

Q: A local county has an unemployment rate of 4.2%. A random sample of 17 employable people are picked…

A:

Q: Reviewing the sample of offspring of "highly irradiated" male radiologists 98 were female and 46…

A: Given :  Reviewing the sample of offspring of "highly irradiated" male radiologists 98 were female…

Q: If t=1.093 with degrees of freedom equal to 10, what percentile does this represent?

A:

Q: The Invisible Gorilla experiment was repeated numerous times. In one experiment, 21 students…

A: (1). It is given that for the invisible gorilla experiment, there are 21 students who are watching…

Q: A researcher wants to test whether UBC students are more intelligent than the general population. He…

A: Given: population mean (μ)=100population standard deviation (σ)=15sample size (n)=36Sample mean…

Q: The Law of Large Numbers states that as the number of observations in a sample increases, the mean…

A: Here we have given the multiple choice question about the law of large numbers. The Law of Large…

Q: A group of potential customers were asked whether they preferred Coca- Cola products or Pepsi…

A: Given:   Coke Pepsi Total Female 121 92 213 Male 134 105 239 Total 255 197 452

Q: For chi-square, what is the difference between observed and expected frequencies?     There is no…

A: The goodness-of-fit chi-square test is related to Pearson's chi-square test , in which observed…

Q: Suppose that we want to estimate what proportion of gift items purchased at a department store are…

A: Given ME= 0.05 Confidence level=95℅

Q: Most people believe that smoking is unhealthy. The table given is the result of a study of randomly…

A: Required probability is P(individuals that died from heart disease were smokers)

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.