In an intelligence exam to determine the IQ of students, it is found out that the results are normally distributed with a mean of 100 and a standard deviation of 16. What is the percentage of students who have IQs between 115 and 140?

Q: In a multiple-choice examination in Chemistry, students Mae and Julie received scores of 82 and 65,…

A: We have given that.   X~N( μ , ?^2 )   μ = , ? =   Z-score =( x - μ )/?

Q: In a standardized IQ test, the mean score is 100 and the standard deviation is 15. According to the…

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Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are the z-scores for the…

A: The mean is 500 and the standard deviation is 100.

Q: Heights of 10-year-olds, regardless of gender, closely follow a normal distribution with a mean of…

A: Given, Heights of 10-year-olds, regardless of gender, closely follow a normal distribution with a…

Q: A one-sample z-test was conducted in which the sample mean was 76, the population mean was 82, the…

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Q: 3. The average age of the marketing executives in an ad agency is 26, with a standard deviation of…

A: Note : Since you have asked multiple questions, we will solve the first question for you. If you…

Q: A test to measure the gullibility of college students is designed to have a mean of 70 and a…

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Q: In 1955, Life Magazine reported that a 25-year-old mother of three worked (on average) an 80 hour…

A: Given that, Sample size of women n=67 Sample average x¯=83 Sample standard deviation s=10 It is been…

Q: For the Reese's pieces scenario, compute the standard deviation of sample taking if the size of the…

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Q: A random sample of 8 adults aged 30 years were asked how much they spent on medical costs in the…

A: Step-by-step procedure to obtain descriptive statistics using EXCEL Add-Ins: Go to Data>Data…

Q: Suppose two sections of the same class take the same exam and produce the results shown in the…

A: The relative frequency distribution of section 1 scores and section 2 scores, are given.

Q: The weights of 60 females in a physical education class are normally distributed with a mean of 135…

A: Obtain the Z-score for the random variable X equals 150 The Z-score for the random variable X equals…

Q: What is the standard deviation for the following sample of scores? Scores: 3,2,4,6,6,3

A: The standard deviation is a measure of dispersion. It tells how much data are deviates from their…

Q: A Survey among Seniors revealed that the number of hours spent Studying the week before final exams…

A: Give Standard deviations=7 Mean=25 P(x>40)=?

Q: Given a normal distribution with a standard deviation of 14, what is the mean if 40% of the values…

A: We know that; X~Normal(μ,σ2) ⇒Z=X-μσ~Normal(0,1) Let X be the random variable with a normal…

Q: Given a distribution with a mean of 90 and a standard deviation of 10, what is the probability of…

A: Given Information: μ=90 σ=10 x1=85 x2=110

Q: A highway study of 8000 vehicles that passed by a checkpoint found that their speeds were normally…

A: Answer - A highway study of  N = 8000 vehicles that passed by a checkpoint found that their…

Q: What is the standard deviation for the following set of N= 5 scores: 10, 10, 10, 10, and 10? (Note:…

A: Given data 10,10,10,10,10and N = 5Mean (μ) :  10+10+10+10+105μ = 505=10

Q: If the standard deviation of sample A  is 5 and the standard deviation of sample B  is 12, what is…

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Q: Again, suppose we are now interested in taking random samples of 800 US adults instead of 150 and…

A: We know that,  Proportion p= X/n Where n is sample size.

Q: For a population of leghorn chickens, the mean number of eggs laid per chicken is 7.3 with standard…

A: Given information: μlegborn=7.3σlegborn=1.7μsussex=5σsussex=0.85 Two independent ransom samples of…

Q: 99 ​331   ​$200–399 96   ​$400–599 57   ​$600–799 23   ​$800–999 9   ​$1000–1199 7   ​$1200–1399 3

A: Following information can be calculated from the given data:

Q: In a survey of a group of men, the heights in the 20-29 age group were normally distributed, with a…

A: To determine: To determine how may would you expect to be taller than 71 inches . Given data: In a…

Q: If the standard error of the mean is σx̅ = 3 and the sample size is n= 64,then the population…

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Q: 3. The number of cars that passes through Sta. Mesa Highway every weekday resembles a normal…

A: Given that mean =8702 ,s.d =678 p( 7000 < x < 8000) =?

Q: reported that the 27-year-old mother of three worked, on average, a 75 hour week. Recently, many…

A: As the population standard deviation is not known, we will use a t-test. The null and alternative…

Q: On a normal distribution, four participants obtained the following deviation scores: –5, 0, +3, and…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: if the sample mean is 10, the population standard deviation is 20, and the sample size is 25, then…

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Q: A physical fitness association is including the mile run in its secondary-school fitness test. The…

A: P(X<348)=?

Q: Is the standard deviation of the sample a good estimate of the variation of salaries of TV…

A: Sample standard deviation is always an unbiased estimate of population sd.

Q: If the standard error of the mean is σx̅ = 3 and the sample size is n = 64, then the population…

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Q: Which of the following would be the standard deviation used in developing the p-control chart?

A: Given:  Proportion of defective product p= 0.03 Sample size n=30  To find standard deviations used…

Q: Consider the experiment of tossing a fair coin three times and observing the number of heads that…

A: If a fair coin is tossed thrice then the sample space is S = {HHH, HHT, HTH, THH, HTT, THT, TTH,…

Q: A z-score that is 6 points below the mean corresponds to a z = -2.00. What is the populations'…

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Q: For a random sample of 500 students aged 15-17 in the United States, the numbers of hours a week…

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Q: Consider the normal distribution of IQs with a mean of 100 and a standard deviation of 16. What…

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Q: Total enrollment in the Kalamazoo Public Schools have a mean and standard deviation of 11,957 and…

A: We have given that  Mean = 11957  and standard deviation = 13 In next five years so, every…

Q: claims that Chip Ahoy Cookies have an x ̅=28.67 per cookie with a SD=2.67. Assuming this information…

A: Given data,Mean x=28.67sd    =2.67  what is the population parameter for the standard deviation?

Q: The sample standard deviation is a measure of what?

A: The sample standard deviation is a measure of spread of scores within a sample data.

Q: In 1955, Life Magazine reported that a 25-year-old mother of three worked (on average) an 80 hour…

A: As per honor code we will only answer first three parts. The sample size is greater than 30 and the…

Q: If you have a sample of n=25, what is the standard error if the population standard deviation is σ =…

A: The standard error of the sampling distribution of the sample mean.

Q: In a normal distribution, if the mean is ten and the standard deviation is one, what would the…

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Q: If the population standard deviation is 20 and the sample size is 25, then what is the value of the…

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Q: In 1955, Life Magazine reported that a 25-year-old mother of three worked (on average) an 80 hour…

A: Given: x¯=83μ=80s=10n=77 Degrees of freedom: df=n-1=77-176 The critical-value is obtained by using…

Q: For a population with a mean of mean=45 and a standard deviation of 10, what is the standard error…

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Q: In a standardized IQ test, the mean score is 100 and the standard deviation is 15. According to the…

A:

Q: The annual incomes of all MBA degree holders working in Los Angeles have a bell-shaped distribution…

A: From the provided information, Mean (µ) = $78,000 Standard deviation (σ) = $11,000 Let X be a random…

Q: In 1955, Life Magazine reported that the 25-year-old mother of three worked, on average, an 80 hour…

A: Claim : the mean work week has increased for women

Q: sample of 25 cappuccinos shows a mean of 42.1 oz of espresso and a standard deviation of 0.38 oz. A…

A: Given: Sample size, n = 25 Sample mean,  = 42.1 Standard deviation, s = 0.38

Q: On an Intelligence Quotient test with a mean score of 100 and a standard deviation of 15, Patrick…

A: The mean is μ=100 and standard deviation is σ=15. The score is x=85 so it follows:…