The Psych 230 students finished the course with a total population mean of 130 points and the standard deviation is 50 points. One student earned 35 points. What is the z-score for this raw score? z-score =

Q: On the past math summative exam, the bottom 20% of students failed to pass the test. The mean for…

A: The mean for the test is, μ=55 The standard deviation is σ=11 Consider that the bottom 20% of…

Q: Raul received a score of 73 on a history test for which the class mean was 70 with a standard…

A: Here we need to find the z score and for that, we have to use the formula z = Value-meanStandard…

Q: What is the corresponding Z- score, mean is 110, standard deviation is 8 and x is 90

A: In question, We'll find the Z - score for mean 110, standard deviation 8 and x = 90. The solution is…

Q: A college conducts a common test for all the students. For the Math portion of this test, the scores…

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Q: The heart rate of 20 patients in the ICU have a mean of 95.3 beats per minute and a standard…

A: We have given that Sample size (n) = 20Sample mean (x̅) = 95.3Standard deviations (s) = 19.6 Mean(µ)…

Q: In a sample of 152 people the average score was 74 with a standard deviation of 6. What is the…

A: Sample size = n = 152   Mean = 74  Standard deviation = 6

Q: a history class has 75 members. if there is a 12% absentee rate per class meeting, find the mean and…

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Q: Linus was visiting the great pumpkin patch where he decided to buy a pumkin from a section of the…

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Q: The IQ test has a mean of 100 and a standard deviation of 15.  Suppose a simple random sample of 150…

A: Ans - Given, The IQ test has a mean μ = 100 and a standard deviation of σ = 15.  Suppose a simple…

Q: Disney has studied its movie customers to determine how much money they spend on their movies. The…

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Q: On the past math summative exam the bottom 20% of students failed to pass the test.the mean for the…

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Q: Princess earned a score of 935 on a Mathematics test. The mean score was 850 with a standard…

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Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Introduction: Denote the random variable, Denote X as the number of hours of sleep on a weeknight.…

Q: Alcohol is claimed to be a factor in 39% of all fatal car accidents in the United States. The town…

A: The sample recored needs to show alcohol as a factor to suggest a significant difference exists…

Q: Determine the number of standard deviations from the mean (z-score). In the United States, the…

A: Given mean female height = 64 inches and standard devaiton = 3 inches.The distance of a data point…

Q: statistics test scores were normally distributed with a mean of 81 and a standard deviation of 5,…

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Q: Hogie lizards have tail lengths that are normally distributed with a mean of 22.5 cm and a standard…

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Q: The number of assists per match for the setter on your school's volleyball team has a mean of 55 and…

A: Given,   Mean(μ) =55 Standard deviation(σ)=7

Q: Convert score 46 to z-score if the mean is 40 and the standard deviation is 4.

A: The definition of a z-score is:   z = (X - μ) / σ

Q: The temperature is recorded at 60 airports in a region. The average temperature is 67 degrees…

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Q: Entrance exam scores at Cititon University are normally distributed with a mean of 792 and a…

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Q: Sarah's score on the second exam was 34 for which the mean of all scores was 28 and the standard…

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Q: Nationally the average score on the college entrance exams (Verbal test) is 453 with a standard…

A: Consider that μ is the population mean score. Null hypothesis: H0: μ = 453. Alternative hypothesis:…

Q: The vocabulary test scores for the population of third graders is normally distributed with a mean…

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Q: What are the best ways to find the standard deviation?

A: Standard deviation is a measure of variability. It describes how far the data falls from the…

Q: 4. On a recent math test, the mean score was 75 and the standard deviation was 5. Mike made 93.…

A: Given that  X~N( μ = 75 , ? = 5 ) μ = 75 , ? = 5 Formula for Z-score  Z-score =( x - μ )/? Note:…

Q: When Christian runs the 400 meter dash, his finishing times are normally distributed with a mean of…

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Q: An incoming MBA student took placement exams in mathematics and economics. In economics, she scored…

A: The mean and standard deviation of economics exam are 74 and 7.

Q: The General Social Survey polled a sample of 1056 adults in the year 2015, asking them how many…

A: From the provided information,

Q: The vocabulary test scores for the population of third graders is normally distributed with a mean…

A: given mean μ=60 , standard deviation σ=12 now for the normal distribution z=x-μσ z=x-6012 to find…

Q: A forest ranger researching ecosystem recovery following forest fires collected data on a large…

A: Given that Mean = 3.2 feet Standard deviation = 0.6 feet

Q: The standard deviation on a final examination was 9, while the mean grade was 72. The best 14% of…

A: GivenMean(μ)=72standard deviation(σ)=9

Q: Many students did an exam, the mean was 15 and the standard deviation was 32 The highest mark was…

A: Given Mean μ=15, standard deviation σ=32  X=103

Q: After taking the final exam, it appears that Tim is part of the 85th percentile in terms of ranking.…

A: GivenMean(μ)=60standard deviation(σ)=3.2

Q: Employees at Executive Management Co. spend an average of 80 minutes on the phone each day. If the…

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Q: Roland received a score of 70 on a test for which the mean score was 65.5. Roland has learned that…

A: Given Information: The score Roland received, X = 70. The mean score,μ= 65.5 Z score of the test =…

Q: Sean’s exam score was 1.93 standard deviations below the mean. If the exam has a mean of 72 and a…

A: The provided information are: Population mean (µ) = 72 Population standard deviation (σ) = 5 Sean’s…

Q: On the SAT, the average Writing score is 490 points and the average Math score is 547 points. The…

A: From the provided information, Average Math score (µ) = 547 points Standard deviation (σ) = 89…

Q: A student takes a test in his math course and scores 45 points and a test in his psychology…

A: Introduction:Consider X as a normally distributed random variable, with mean μ and standard…

Q: Jason's z- score in the 10-k run was -3. if the raw score standard deviation was 5, and the mean…

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Q: In a standardized exam the mean score is 400 with a standard deviation of 50. If a random sample of…

A: Given that  μ= 400 , σ= 50 , n = 25

Q: boulder 10k race was 1.78 standard deviations faster than women's average group. 405 women ran ,…

A: Given See the handwritten solution

Q: Justin got a score of 85 on an GE MMW examination for which the mean is 75. Justin realized that the…

A: Given, Justin got a score of 85 on an GE MMW examination for which the mean is 75. Justin realized…

Q: Raul received a score of 76 on a history test for which the class mean was 70 with a standard…

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Q: If a student scored 77 points on a test where the mean score was 84.5 and the standard deviation was…

A: Given: Score of student(x)=77Population meanμ=84.5Population standard deviationσ=5.1

Q: What is the z score for 120 when mean is 100 and standard deviation is 5.

A: We have to find z score for 120 when mean is 100 and standard deviation is 5.

Q: The mean weekly sales of the chocolate bar in candy stores was 146-3 bars per store. After an…

A: Given: μ=146.3sample mean, x¯ =153.7sample size, n=22sample sd, s=17.2

Q: The results of a common standa population mean is 105 and the standard deviation is 30. A subject…

A: A z-score is a numerical measurement that describes a value's relationship to the mean of a group of…

Q: The average score on the Stats midterm was 79 points with a standard deviation of 4 points, and…

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Q: A class of 150 students took a final examination in science. The mean score was 72% and the standard…

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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.