The score on an exam from a certain statistics class, X, is normally distributed with u = 77.9 and o = 9.5. NOTE: Assume for the sake of this problem that the score is a continuous variable. A score can thus take on any value on the continuum. ( life, scores are often treated as if they were continuous values but are actually discrete in most cases.) Round your z-scores to 2 decimal places for this problem. Give your probabilities to 4 decimal places. (a) Write the event "a score over 67.9" in terms of X: (b) Find the probability of this event: (C) Find the probability that a randomly chosen score is greater than 87.4: (d) Find the' probability that a randomly chosen score is between 67.9 and 87.4: .

Q: QUESTION 10 You are interested in seeing whether emotions impact decision making. You have three…

A: Formula for the mean square within (MSW) samples :  MSW=SSWdfW Where ,   SSW  is the sum of square…

Q: roblem #5: Suppose that the distribution of the lifetime of a car battery produced by a certain car…

A: Mean μ=1800 Variance σ2=104=10000 The distribution of the lifetime of a car battery produced by a…

Q: What can we say about the percent of days with a high temperature between 74.6 and 100.4 degrees?…

A:

Q: To pass the time during a long drive, you and a friend are keeping track of the makes and models of…

A: As per information provided among the last 20 cars, there hasn't been a single Ford. Currently,…

Q: A negative value of z indicates that a. the data has a negative mean. b. a mistake…

A: A negative value of  z indicates that Select the correct choice

Q: QUESTION 37 A variable that takes on the values of 0 or 1 and is used to incorporate the effect of…

A: It is given that the variable takes the values 0 or 1. Here, need to find out the correct choice for…

Q: Here are histograms of the values taken by three sample statistics in several hundred samples from…

A: It is asked that among the three given statistics which is the best estimate of the parameter.

Q: On the space provided, answer the following questions briefly. 1. Explain what is meant by…

A: Descriptive statistics tell us about the data like its mean, variance, range and so on.  It covers…

Q: Assume that a randomly selected subject is given a bone density test. Bone density test scores are…

A:

Q: 2 3 4 y 5.8 4.4 4.3 3.5 X 1 5 6 3.4 2.6

A: The given bivariate data set is:

Q: Scenario #1. Part I. The population mean of American women is 70 inches with a and a standard…

A: The objective of the question is to find the Z score for a female who is 71.5 inches tall, given…

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores…

A: Given that.   X~N( 0 , 1 )   μ=100  , ?=15   Z-score =( x - μ )/?

Q: Question 6B  A manufacturer of cutting and welding products makes an acetylene gas cylinder used in…

A: Given that  The mean 124 m3 and a standard deviation of 12 m3  X~N(124, 122)

Q: Use the data below to answer the following questions: Person Before Competition After Competition…

A: Formula : Standard error : Se = Sd/√n

Q: Mr. Green examines the Unit 1 Biology test scores in his class. The test scores are normall-…

A: The z-score is known as the standard score.

Q: QUESTION 2 Solve the following backwards problem: Biddy Charleston owns a high-end art gallery. She…

A: Given

Q: Use this information to answer questions 19-22 The Centers for Disease Control (CDC) reported on…

A: The general trend is that the people were much heavier in 2002 compared to 1960. The investigator…

Q: Find the indicated z score. The graph depicts the standard normal distribution with mean 0 and…

A: Standard Normal Distribution Since the frequency distribution is symmetrical on both ends of the…

Q: QUESTION 4 If two data sets have the same standard deviation they will have the same average. Ⓒ True…

A: According to the given information in this question We need to identify the correct option

Q: Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those…

A: From the provided information, Mean (µ) = 100 Standard deviation (σ) = 15 X~N (100, 15)

Q: You are interested in seeing whether emotions impact decision making. You have three groups--a happy…

A: Given information: There are 3 groups. Each group has 5 participants. Total number of participants…

Q: Age discrimination: The following table presents the numbers of employees, by age group, who were…

A: H The people in all age groups are equally likely to be promoted.H The people in all age groups are…

Q: Consider the following data and answer the following questions. Data: 1, 2, 3, 6, 7, 8, 12, 15, 18,…

A: here use basic of percentile, and some measures of central tendency here given data…

Q: The MTA’s daily operating profit is normally distributed with a mean of -30 million dollars (that’s…

A: X follows a Normal distribution with mean = -30 and S.D = 50 Then z=(x-mean)/SD = (x-(-30))/50…

Q: Which of the following are true?  A. At least three quarters of the data values in D1 are less than…

A:

Q: Let X be a test score for a test. The standard deviation of X is 7 and the mean of X is 19. The…

A: Here From Realibility coefficient we will find how reliable is this ...

Q: Another researcher points out that he should also include two additional variables before starting…

A: Introduction: It is required to identify the first variable to be removed from the model.

Q: Fresh Donuts! A donut company says that their donuts remain fresh for over 3 days on average. We…

A: From the provided information, Sample size (n) = 16 Level of significance (α) = 0.05

Q: Question 2: If (X) represents a set of data of three elements (a, b and c) has a standard deviation…

A: From the given information, Consider, X has the following data points: a =4 , b =6, c = 10  and Y…

Q: Question 5: On average, a banana will last 6.2 days from the time it is purchased in the store to…

A: We have given data are 6.3,8.6,5.2,7,7.4,8.4,8.5,6.2,7.5,6.4,5.9,8.2,7.3,7.9 We make the following…

Q: In a certain age group of boys height has approximately normal distribution. Determine how large is…

A: Given: μ=mean=170x=data point=179 X follows Normal distribution with mean μ and standard deviation…

Q: An analysis conducted by the accounting department at Stan's Jeans found a linear relationship…

A: The regression equation is,Dependent variable=The number of pairs sell at storeIndependent…

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores…

A: Given that  Mean = 100  Standard deviation = 15

Q: For questions 7 and 8, identify whether the median would be expected to be less than the mean,…

A: Two graphs, corresponding to response time, are given.

Q: Question 2: Identify the type of data that would be used to describe a response. Categorical,…

A: Given Information: The given statement is " Number of tickets sold to a concert".

Q: port question 2 and 3

A: Data x, y, or z Final data values 0.854 0.15 1.004 1.023 0.15 1.173 1.005 0.15 1.155 1.03…

Q: Assume that a randomly selected subject is given a bone density test. Those test scores are normally…

A: given data standard normal distributionZ~N(0,1)for lowest 8% and highest 8%.cutoff scores are ?

Q: QUESTION 9 You are interested in seeing whether emotions impact decision making. You have three…

A: Given that  Number of treatment = k = 3 Sum of square between sample = SSB = 1.6

Q: Which of the following statements is false? The range of the data is always less than the…

A: which of the statement is false

Q: 2. Recovering from surgery: A new postsurgical treatment was compared with a stan- dard treatment.…

A: From the information, given thatLet  denotes the population mean recovery time receiving the new…

Q: QUESTION 13 You are interested in seeing whether emotions impact decision making. You have three…

A: The question is about ANOVA  Given : Sum of sq. between samples ( SSG )= 1.6 Sum of sq. within…