Suppose X - N(-1, 2). What is the z-score of x = 2?

Q: Let Y denote the average age of the two children that are selected. What are all the different…

A: couple has 6 children. Jo, Co, are both 10 years old (they were twins), Joey is 8 years old, and…

Q: Find the z-score that cuts off 70% in the body on the right.

A:

Q: Doctors nationally believe that 78% of a certain type of operation are successful. In a particular…

A: Introduction: Denote p as the true national proportion of operations that are successful. As it is…

Q: If two individuals in different populations have identical X scores, they also must have identical…

A: The z score indicates how many standard deviations that a point is away from the mean. z scores can…

Q: A lamp manufacturer company tests the two new models of LED spotlights for commercial use, trying to…

A: The hypothesis will be stated  H0: μ1= μ2H1: μ1≠ μ2 This is a two tailed hypothesis test ANOVA test…

Q: There is a test designed to measure overall life happiness, (where higher scores indicate more…

A: Given, μ = 85σ = 12 Higher scores indicate more happiness.         To find: a. Person with lowest…

Q: An education researcher claims that at most 3% of working college students are employed as teachers…

A: Solution: From the given information, p-hat=0.04 and n=200. The given claim is that at most 3% of…

Q: Find the z-score if the area to the right of z is .3523 and area to the left of –z is 0.3342.

A: Standard normal score: The standard normal score follows a normal distribution with mean 0 and…

Q: If all the possible random samples of n=81 scores are selected from a normal population with u=80…

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: The area to the right of z-score of 0 is

A: We know that the Z is standard normal variate with mean 0 and variance 1  i.e. Z~N(0,1) Since the…

Q: Find the z-score that cuts off 65% in the body on the left.

A:

Q: he table shows the average APM** of 5 random Dota2 players along with the player’s win rate.

A: The data set is: Average APM Win rate 315 53.45 150 51.21 80 52.16 150 54.74 130 55.57

Q: If my p-value is 0.062 should I reject it and support my claim?

A: Basic: Rejection or acceptance of null hypothesis  is totally depending  on p values and…

Q: A statistician computed the Z-scores of all the observations in a sample and after he added all of…

A: The Z-score for the ithobservations in a sample is given by :  Zi=xi-μσ The sum of the Z-scores for…

Q: A smartphone manufacturer admits that 12% of the smartphones they make have defects that could…

A: Given Data: 'X' is the number of smartphones manufactured that have defects p=0.12 n=20   X~…

Q: A research worker wants to determine the mean time it takes a mechanic to rotate the tires of a car,…

A: From the provided information, Confidence level = 95% Population variance (σ2) = 2.56 Then, the…

Q: What is the purpose of testing whether β1=0? If we reject β1=0 does it imply a good fit?

A: β1 is the slope in a regression model.

Q: A researcher hypothesized that score differed between th golfers from the 2021 U.S. Open. At the…

A: Given :  Paired data for randomly selected golfers α = 0.05

Q: How can I compute P-value?

A:

Q: A real estate agent working in a large city believes that, for three-bedroom houses, the selling…

A: From the given information,       β1( slope)=-2.158,S.E( β1) =0.149n=20α=0.05

Q: a total of 20 applicants came in for a job interview. Among them, four were 45 years old, six were…

A: Given Data : X f 45 4 39 6 42 3 40 5 35 2 N = 20 Mean =x =∑fxN Var=1N∑fx2-x2 SD=Var

Q: Suppose that the random change in value of a financial asset is X over the first day and Y over the…

A: The variance of X+Y is calculated asVarX+Y=VarX+VarY-2CovX,Y

Q: In a sample of 50 leopards selected randomly from one preserve, it is found that 33 of them have…

A: Given, The sample proportion is,

Q: In a sample of 74 leopards selected randomly from one preserve, it is found that 7 of them have…

A: Solution: Let X be the number of leopards have respiratory problems and n be the sample number of…

Q: A smartphone manufacturer admits that 12% of the smartphones they make have defects that could…

A: 1. Given that X=the number of smartphones manufactured by this company that have defects that could…

Q: Suppose that X1, X2,... Xn are n values of a variable X and X is the arithmetic mean. Can we obtain…

A:

Q: In a random sample of 80 Americans, 45 wished that they were rich. In a random sample of 90…

A:

Q: Suppose 1.5% percent of the ball bearings made by a machine are defective and the ball bearings are…

A: Introduction to binomial distribution: Consider a random experiment involving n independent trials,…

Q: Suppose, you are running an experiment for 'x' times where the probability of success in a single…

A: Given : It is a binomial distribution with two outcomes as either success or failure. Probability of…

Q: A real estate agent working in a large city believes that, for three-bedroom houses, the selling…

A: Given: n = 20 Slope = -2.158 Standard error for the slope  of regression line = 0.149 Significance…

Q: If the coefficient increases and the standard error stays the same, the p-value will decrease.…

A:

Q: a) Mr. Kashif got an average of 50 in 6 tests. What should he get in the next test to obtain the…

A:

Q: The first quartile (Q1) of 2, 4, 4, 5, 6, 7, 8 is equal to 6. OOOO 2.

A: Given that, Data set: 2, 4, 4, 5, 6, 7, 8

Q: I need to find the z-score of p72

A: Here, p72 represents the 72 percentile.

Q: In a college,there are 20 major subjects and 40 minor subjects,these are divided into 20 groups of 2…

A: Probability is a branch of mathematics or statistics which is basically deals with the chances of…

Q: X is the number of defective parts in a sample of 10 randomly selected parts coming from a…

A:

Q: Suppose X ~ N(18, 4). What value of x has a z-score of -2.52? Round to 2 decimal places..

A: Given :- X ~ N(18, 4).  Than we have to find the value of x has a z-score of -2.52.

Q: Suppose X~ N(-1, 2). What is the z-score of x = 2?

A:

Q: Calculateaconfidenceinterval for the me-dian ofthe second population.Select your confidenc eleve…

A:

Q: clinical​ trial, 29 out of 853 patients taking a prescription drug daily complained of flulike…

A: The null and alternative hypotheses are: Ho: p = 0.029Ho:p=0.029 Ha: p > 0.029Ha:p>0.029…

Q: A deck has "b" black cards and "y" yellow cards. Given that cards are drawn at a random fashion…

A: Solution: From the given information, a deck has “b” black cards and “y” yellow cards. Given that…

Q: Consider the case where the predetermined average number of bus arrivals at the Cubao Station is 6…

A: As given, the average number of bus arrivals at the Cubao Station is 6 per 15-minute period. Let λ…

Q: A sample obtained from a population with σ = 12 has a standard error of σx̅ = 2 points. How many…

A: We have given that,  The population standard deviation (sigma) = 12 And standard error (sigmax) = 2…

Q: For the population, 57% of people are searched if stopped.  For a sample of 26441 stops, what Z-test…

A:

Q: Suppose that the blood pressure for a randomly selected patient has an average of 22 and variance of…

A: Random variables are of 2 types, discrete and continuous. Normal distribution is a continuous…

Q: It is claimed that the percentage of viewers tuned to a TV station's new sitcom is 30%. Out of the…

A:

Q: A researcher selected a sample of 268 former student-athletes from a list of graduates of a large…

A: Population proportion = p₀ = 0.17   Sample size = n =268 Sample proportion = p̂ =  0.14

Q: A research center claims that at least 27% of U.S adults think that the IRS will adult their taxes.…

A: Let p be the population proportion of U.S adults think that the IRS will adult their taxes. The…