A 95% confidence interval based off a SRS of size n-100 for the mean hours students spend studying for the final exam is between 3.4 and 3.7 hours. The population standard deviation is given by:

Q: Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 530 and a…

A: The objective of the question is to find the percentage of people taking the GRE who score within…

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

A: Solution: Let X be the score on a Literature test. From given information, X has mean µ=80 and a…

Q: If a set of data is normally distributed with a mean of 50 and a standard deviation of 5, a z-score…

A:

Q: Scores on a certain standarized test have a mean of 500, and a standard deviation of 50. How common…

A: Given, Mean = μ =500SD = σ = 50

Q: Salaries of 33 college graduates who took a statistics course in college have a mean, x, of $69,000.…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: Find the lower boundary of the 90% confidence interval for the variance of the ages of seniors at…

A: Given information: n=24 s=2.04 Confidence interval for variance: n-1s2χ1-α2,n-12≤σ2≤n-1s2χα2,n-12

Q: An SRS of 350 high school seniors gained an average of ?¯=45 points in their second attempt at the…

A: n = 350x¯ = 45σ = 2690% ci for μ = ?

Q: Six people were injected with antibiotics at a dosage of 10 mg per kg body weight. The blood…

A: The 95% confidence interval for the population mean is obtained below: From the given information,…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 98.7 and a standard…

A: Given data, μ=98.7σ=16.2P(X<x)=25%x=?

Q: Question Test scores for a given class are normally distributed with a mean of 80 and standard…

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given : Margin of error = 5 α = 0.05 Population standard deviation = σ = 30 zα2 = z0.052 = 1.96

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.5 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100.5 and standard…

Q: ed in the table. = 0.0804 and the standard deviation of the differences is xdif = fference in the…

A:

Q: Wall thickness of 25 glass 2-liter bottles was measured by a quality-control engineer. The sample…

A: Given that  Sample Mean \bar XXˉ = 4.104.10 Sample Standard Deviation (s)(s) = 0.080.08…

Q: A random sample of 100 observations produced a mean x̅ =38.5 and a standard deviation of 3.2. find a…

A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…

Q: tallation of a new computer plug in station? After the plug in station was built, the librarian…

A: The mean = 57.8The standard deviation = S = 6The sample size [n] =51Use t-distribution.

Q: The mean IQ score of a sample of 61 students selected from a high school is 93. Suppose the standard…

A: Construct the 99% confidence interval for the population mean The 99% confidence interval for the…

Q: A police recruit received a score of 70 on an indurance test for which the mean score is 65.5. The…

A: We know that the If μ is the mean score and σ is the standard deviation for this set of test scores,…

Q: Glucose levels in patients free of diabetes are assumed to follow a normal distribution with a mean…

A:

Q: A recent study of 28 city residents showed that the mean of the number of years they lived at their…

A: The formula of confidence interval for the population mean is given by                  confidence…

Q: The absolute value for the difference between the two ladies z-score is

A: Let , X→N(μ=15.7 , σ=7.43) Since , the Rena's score on the exam is 9 and Sara's score was 25. We…

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A: Given : The combined SAT scores for the students at a local high school are normally distributed…

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: Q scores based on the Wechsler Adult Intelligence Scale (WAIS) are assumed to be normally…

A: Given data,Mean μ=100standard deviation σ=15Score is x=125z-score=?

Q: The patient recovery time from a particular surgical procedure is normally distributed with a mean…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

Q: the quality grade point averages of 300 college freshmen follow approximately the normal…

A: Given: X~N(μ,σ)μ=2.1σ=0.5 n=300

Q: scores on an english test are normally distributed with a mean of 31.5 and a standard deviation of…

A: X follows a Normal distribution with mean = 31.5 and S.D = 6.9 Then z=(x-mean)/SD = (x-31.5)/6.9…

Q: Find a 99% confidence interval for the population mean age of the Smurfs, if a sample of 50 smurfs…

A:

Q: What is the test statistic for this procedure?

A: Assume that all conditions are met. The mean of the differences was 1.33 and the standard deviation…

Q: Weights of incoming college freshmen are normally distributed with a mean of 150 lbs. and a standard…

A:

Q: Assume that a sample is used to test a normal population mean u. A sample is of size 32 with a mean…

A:

Q: A medical doctor who wanted to study the heights of adult men and women took a random sample of 150…

A: Given n1=150 n2=120

Q: Scores in a particular Mathematics test are normally distributed with mean of 175 and standard…

A: Scores in a particular Mathematics test are normally distributed with mean of 175 and standard…

Q: The mean yield of corn in the United States is about 120 bushels per acre. A survey of 40 farmers…

A: Let μ be the population mean. The test is to check whether there is enough evidence from the sample…

Q: A random sample of 250 students at a university finds that these students take a mean of 15 credit…

A: Solution: From the given information, the 99% confidence interval for the mean credit hours is…

Q: 20 TV remote controls were followed over the years to find the mean lifespan of this model. The…

A: Answer - Here  n = 20 TV remote controls were followed  over the years to find the mean…

Q: The patient recovery time from a particular surgical procedure is normally distributed with a mean…

A: Given: Population mean recovery time μ=4.1 Population standard deviation time σ=3.9 Observed time…

Q: The annual per capita consumption of oranges (in pounds) in the United States  can be approximated…

A: It is given that the mean and standard deviation are 19.2 and 4, respectively.

Q: On an exam, Tom scored 8 points above the mean and had a z-score of +2.00. The standard deviation…

A: Given: z-score=2 Score above the mean=8