Question Help Suppose you buy a new car whose advertised mileage is 20 miles per gallon​ (mpg). After driving your car for several​ months, you find that its mileage is 15.5 mpg. You telephone the manufacturer and learn that the standard deviation of gas mileages for all cars of the model you bought is 1.21 mpg. a. Find the​ z-score for the gas mileage of your​ car, assuming the advertised claim is correct. b. Does it appear that your car is getting unusually low gas​ mileage?

Q: Molly's score was 68 on a test with a mean of 80 and a standard deviation of 9.  What is her…

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Q: Find the z-score for the value 62, when the mean is 56 and the standard deviation is 2. O A. z=3.00…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: When a Calculus professor is determining the curve for her final exam, she finds that the mean score…

A: Z= x-μσ~N(0,1)

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

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Q: . less than 24 mpg? B. 30 mpg or more? C. between 20 and 28? 2

A: Question 1)The mean of the distribuiton is  mpg. The standard deviation of the distribution is…

Q: Provide an appropriate response. Find the z-score for the value 68, when the mean is 69 and the…

A: Given that  Mean=69 Standard deviation=2 To find the Z score for the value 68.

Q: What is the sample mean of SAT-V? (Round to the hundredth place if it is necessary.) 2. Can the…

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Q: Aisha and Amber both took the ACT on the same day. They both earned a 27, but in different sections.…

A: Given: Aisha had earn 27 on her Science and Amber had earn 27 on her Math. For Science: μ = 20.9σ =…

Q: ne table to the right lists the monthly price n dollars) of a pound of coffee and a allon of…

A: We have given that,  The data set of coffee prices are: Coffee prices (X) : 4.58, 4.16, 5.72, 4.56,…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

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

A: Given information Mean = 100 Standard deviation = 15 P(X > x) = 0.65 P(X < x) = 1 – 0.65 =…

Q: For an Economics test the mean score is 100 and the standard deviation is 10, and for an Accounting…

A: The mean and standard deviation of Economics are 100 and 10.

Q: 7. The following table shows the returns of an energy sector ETF. What is the Mean Absolute…

A: We have given information about the return of energy sector as follows, Year Energy Sector ETF…

Q: help me need text answer urgently. Question. Molly injured her ankle 12 weeks ago. Each week, her…

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Q: Consider a value to be significantly low if its z score less than or equal to −2 or consider a value…

A: The mean test score  to assess readiness for college = 20.8 Standard deviation = 4.5   Given z…

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A: Data for two groups is given. We have to check which data set has more variability according to…

Q: Jessica is working on some statistics for her employer.  She finds that the variance of the data she…

A: The variance of the data Person J is analysing is 81.

Q: The student's weighted mean score is (Simplify your answer. Round to two decimal places as needed.)

A: Given that  x Weighted (w) w*x 88 35 3080 89 5 445 90 10 900 91 5 455 99 45 4455…

Q: What was the cutoff for a failing score? Approximately what percentage of the students failed?

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Q: standar For Jesse 13. a. Find the mean and standard deviation of a normal distribut of marks in an…

A: Note: we are using standard normal distribution table.

Q: Use the following data to answer the following questions. You can use excel or any app. as…

A: The question is about measures Given :

Q: The length of human pregnancies from conception to birth varies according to a distribution that is…

A: Given mean =266 days standard deviation =16 days.

Q: ends enroll in the same math course at the university they are attending.  On the first exam Sam…

A: Given: Sam scores 35 (the mean in this class is 34 with a standard deviation of 15).   Thus,…

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

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Q: standard deviation is s = 30. Determine the test statistic for this test.

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Q: The standard deviation of the following data set is: 2,5,9, 7 O 5.57 O 2.99 O 7.07 O 8.92

A: #Given, data  set      2,5,9,7   Now  mean x=2+5+9+74=234=5.75

Q: None

A: First, we need to find the probability between 73 and 86 and then use this to find the number of…

Q: We know that IQ scores are normally distributed with a mean of 100 and a standard deviation of 15.…

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Q: The teacher in a kindergarten school measures the height of her students. If the heights were…

A: Mean()=112standard deviation()=15

Q: A large group of students took a statistics test.               The mean score, from the scale of…

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Q: Based upon past flight data, the average weight of checked baggage was 44.5 pounds with a standard…

A: Given that  X~N( μ = 44.5 , ? = 3.6 ) μ = 44.5 , ? = 3.6 , n = 400 Z-score =( x - μ )/?

Q: Which one of the following is the coefficient of variation for the given data? Students Test Scores…

A: The coefficient of variation is a measure which can be used to compare dispersion (variability) of…

Q: Psychology students at a university completed the Dental Anxiety Scale questionnaire. Scores on the…

A: Suppose X denotes the scores and it follows a normal distribution. The normal distribution has a…

Q: The scores of students on a standardized test are normally distributed with a mean of 300 and a…

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Q: II. Find the scores that are included in the following percentiles: 1. P50 2. P90 3. P10 III. Solve.…

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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.