Scores on a standardized exam are known to follow a normal distribution with standard deviation o = 21. A researcher randomly selects 75 students and computes their average score. He reports that the mean score is 73.4, with a margin of error of 5.641. How confident are you that the mean score for all students taking the exam is in the interval (67.759, 79.041)? Confidence =

Q: A distribution of values is normal with a mean of 123.2 and a standard deviation of 62 Find P35,…

A: Given: A distribution of values is normal with  μ=123.2 , σ=62

Q: A mandatory competency test for high school sophomores has a normal distribution with a mean of…

A: Suppose a random variable X, defines the scores in competency test for high school sophomores.

Q: A study found the lengths of daily driving time for people in your district are Normally distributed…

A: The mean is 35 minutes and the standard deviation is 3.

Q: a division wide aptitude test in mathematics was conducted to 1000 students. the mean of the test is…

A: Given : No. of students : Sample size (n) = 1000 Let X : Scores in aptitude test in mathematics…

Q: A succesful basketball player has a height of 6 feet 4 inches or 193 cm based on statisc from data…

A:

Q: Scores for a standardized test are normally distributed with a mean of 1200 and a standard…

A: given data μ = 1200σ = 60 normal distributionn = 64P(1200<x¯<1214) = ?

Q: College students average 7.8 hours of sleep per night with a standard deviation of 40 minutes. If…

A:

Q: A teacher says that the top 9​% of the class received an A on the last test. The scores were…

A: Given that the mean is 67 and the standard deviation is 18. That is, μ=67, σ=18 A teacher says that…

Q: You invented an iPhone app. The mean time that users engage with this app is 8.2 minutes and the…

A: The mean is 8.2 minutes and the standard deviation is 1 minute.

Q: Scores on a Literature test have an average of 80 with a standard deviation of 6. What is the…

A: The mean is given to be μ=80 and standard deviation of σ=6. The value of x=74 The formula for…

Q: samples of n = 100 from

A:

Q: Scores on a standardized exam are known to follow a normal distribution with a standard deviation…

A:

Q: What is the corresponding Z score ? Mean is 70, standard deviation is 10 and X= 89

A: We have to find z score.

Q: We want to compare cholesterol levels between men and women, so we collect a sample of 20 women and…

A: From the given information,

Q: A normal distribution has a mean of 80 with a standard deviation of 20 what score separates the…

A: Let x be the score which follows normal distribution with mean 80 and standard deviation 20. The…

Q: The mean of a test is 400 and the standard deviation is 75. It is normally distributed. A sample of…

A: 1] Mean μ=400 2] standard deviation σ=75 3] n=25 4] μx¯=400σx¯=σn=7525=15

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: From the Part (iii), the null hypothesis is rejected.

Q: A certain standardized tests math scores have a bell shaped distribution with a mean of 525 and a…

A: GivenMean(μ)=525standard deviation(σ)=105

Q: Find the mean, the standard deviation and the Z scores corresponding to the minimum and maximum…

A: 2.3, 1.0, 2.1, 6.5, 2.8, 7.8, 1.7, 2.9, 4.4, 5.1, 2.0

Q: A distribution of values is normal with a mean of 187.9 and a standard deviation of 71.2. Find P80,…

A:

Q: ly normal and has a standard deviation of 88% of students scored above a 800. What is the mean of

A: The mean of the binomial random variable obtained by the formula μ=np, where (n) is the number of…

Q: mandatory competency test for high school sophomores has a normal distribution with a mean of  425…

A: Given that.   X~N( μ , ?)   μ=425     , ?=83   Z-score =( x - μ )/?

Q: Scores on a standardized exam are known to follow a normal distribution with standard deviation o =…

A:

Q: A mandatory competency test for high school sophomores has a normal distribution with a mean of 495…

A:

Q: Use the normal distribution of IQ​ scores, which has a mean of 105 and a standard deviation of13,…

A: It is given that the mean is 105 and standard deviation is 13.

Q: The MF exam has a population mean of 500 and a standard deviation of 200. What are the scores for…

A: Let X=MF exam scores We have given information, The population mean μ=500 And population standard…

Q: A mandatory competency test for high school sophomores has a normal distribution with a mean of 410…

A:

Q: The SAT Math scores have a bell-shaped distribution with a Mean of 567 and a Standard Deviation of…

A: We have given that,  Let the SAT scores are normally distributed with mean (mu) = 567 and standard…

Q: In 1988, on the math SAT, the males taking the exam averaged about 500, while the females averaged…

A: From the provided information,

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: LSAT test scores are normally distributed with a mean of 151 and a standard deviation of 5. What…

A: Given; Mean=μ=151SD=σ=5 Let X be a random variable which is normally distributed with mean 151 and…

Q: Scores on a standardized exam are known to follow a normal distribution with standard deviation 14.…

A:

Q: You would like to estimate the variance and standard deviation for credit scores based on FICO.…

A: Construct the 95% confidence interval estimate for the variance of credit scores Obtain the critical…

Q: The population average for SAT scores is known to be 500 with a standard deviation of 100. This…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

Q: The total annual precipitation for a region is approximately normally distributed with a mean of…

A: Given information- Population mean, µ = 1050 mm Population standard deviation, σ = 400 mm Let, X be…