On the Standford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with a resulting mean of 94 and a standard deviation of 9.12. What is the margin of error of the 90% confidence interval of the average IQ of the kindergarten pupils?

Q: If a sample has a mean of 250 and a standard deviation of 15, what is the value in the data set that…

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Q: If a sample has a mean of 150 and a standard deviation of 9, what is the value in the data set that…

A: Given,mean(μ)=150standard deviation(σ)=9Z-score=1.58

Q: Among those taking the Graduate Record Exam, 18 people are randomly selected. This group had a mean…

A: n = 18 s =140 mu = 550

Q: Let Z be a standard normal random variable. Use the calculator provided, to determine the value of…

A: Introduction: The random variable, Z has a standard normal distribution. Thus, its parameters are,…

Q: According to a recent poll of eight social networking sites, the average monthly visitor count was…

A: In question, Given that a recent poll of eight social networking sites, the average monthly visitor…

Q: A student wanted to construct a 99% confidence interval for the mean age of students in her…

A: Solution:From the given information, number of students is 9 and confidence level is 99%, sample…

Q: The mean weight of a popular breed of bull is 1135 pounds with a standard deviation of 97 pounds.…

A: According to the given information in this question We need to find the value of standard error

Q: he sample mean for a recent introductory psychology test was 78, and the standard deviation was 3.…

A: Given Information: Mean = 78 Standard deviation = 3 Student received a score of 82 i.e., X = 82…

Q: A study was made of a sample of 25 records of patients seen at a chronic disease hospital on an…

A: Given data : Sample size = 25 Sample mean = 4.8 Sample standard deviation = 2 Population mean = 4…

Q: An IQ test has a mean of 99 and a standard deviation of 15. Which is more unusual, an IQ of 69 or an…

A: GivenMean(μ)=99standard deviation(σ)=15

Q: The mean for the verbal component of the SAT is reported as 500, with a standard deviation of 100. A…

A: It is given that the sample mean is 498 and the population standard deviation is 100.

Q: From the scores in subject statistics for 8 students, it was found that the mean score is 73 and the…

A: We have given that,  Sample mean (x̄) = 73,  standard deviation (s) = 5.15 and sample size (n) = 8…

Q: A random sample of 110 Americans was asked how many hot dogs they eat each year.  The sample mean…

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Q: For a group of 45 students taking a PSDTF test, the mean heart rate was 96 beats per minute, and the…

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Q: 2. In a recent study of 35 college students, the mean number of hours per week that they played…

A: According to the given information in this question  We need to find the 95% confidence interval

Q: The average score for 100 teenagers playing a certain computer game was 80,000 points per player. If…

A: Here we need to construct a 68% confidence interval for the mean score of all teenagers. Given…

Q: A recent survey of 8 social networking sites has a mean of 13.1 million visitors for a specific…

A: We ignore million while calculation.

Q: One​ year, the mean age of an inmate on death row was 40.7 years. A sociologist wondered whether the…

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Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given that, Mean = 13.1 Standard deviation = 3.1 Sample size = 8

Q: A Industrial Psychology test was written. From a sample of 50 students and it was found that the…

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Q: A group of 59 randomly selected students have a mean score of 29.5 with a standard deviation of 5.2…

A: It is given that n=59, x=29.5 and s=5.2. The value of z at 90% confidence interval is 1.645.

Q: From a random sample of 64 high school seniors, the sample mean and standard deviation of the math…

A: Given,mean(x)=90standard deviation(s)=7sample size(n)=64α=1-0.92=0.08α2 =0.04degrees of freedom…

Q: A sample of 200 smokers were asked at what age they started smoking. The meanage was 18.3 years. The…

A: Solution:From the given information, population standard deviation value is 4.35 years and sample…

Q: The mean reading speed of a random sample of 81 adults is 320 words per minute. Find a 90%…

A: Given: n=81, x=320 and σ=45.   The value of z at 90% confidence level is 1.645. (From the z-table)

Q: On the Stanford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with a…

A: Given  population mean μ=100, n=sample size=21, sample mean x̄=92, sample standard deviations s=6.92…

Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given, Sample size = 8 Sample mean = 13.1 Sample standard deviation = 4.1   Since the population…

Q: A recent study of 25 motorists showed that they spent an average of 750 pesos per week. The standard…

A: We have to find  99% confidence interval of the true mean.

Q: Do you prefer taking tests on paper or online? A college instructor gave identical tests to two…

A: It is assumed that the population variances are equal. The null and alternative hypotheses are…

Q: A college alumni Organization sent a survey to all recent graduates to ask their annual income. 20%…

A: Given, All recent graduates of a college were asked their annual income for a survey that was…

Q: In a random sample of 2500 men being treated for obesity, the mean total cholesterol level is 175…

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Q: For a group of 20 students taking a PSDTF test, the mean heart rate was 96 beats per minute, and the…

A: Solution: Let X be the heart rate. From the given information, x-bar is 96 beats per minute, S=5 and…

Q: We measure the heights of 57 students and obtain a sample mean of 67 inches and a sample standard…

A: Given information- Sample size, n = 57 Sample mean, x-bar = 67 inches Sample standard deviation (s)…