A sample of 6 credit ratings for car loan applicants has a mean of 602 and a variance of 4356. Use the data toconstruct a 90% confidence interval for the population standard deviation of credit scores for all applicantsfor car loans. What is the Best point estimate and Include the written statement

Q: The GPA of accounting students in a university is known to be normally distributed. A random sample…

A: A random sample of 26 accounting students has a mean of 2.61 and a standard deviation of 0.13.

Q: A sample of 60 people who were chosen for a sample had an average IQ score of 105. If the population…

A: From the given, x¯ (mean IQ score from sample)=105n (sample size)=60σ (population SD of IQ…

Q: Kala recently switched her primary doctor to one specializing in caring for elderly patients. On her…

A: Givensample size(n)=10Mean(x)=125standard deviation(s)=24significance level=0.05

Q: Blood glucose levels for overweight tweens, adolescents between the age 9-12, have a mean of 100…

A: A hypothesis test can be conducted to test whether the population mean is equal to the claimed value…

Q: Marine biologist at Nova Southeastern University spent three months on a research expedition tagging…

A: The given information is: For females,  Sample sizen1=142 Sample meanx¯1=68.3 Sample standard…

Q: The time needed for college students to complete a certain test follows a normal distribution. A…

A: We have given that,  Sample size (n) = 9 and sample standard deviation (s) = 3.5 and and sample mean…

Q: The average weight of 36 randomly selected school buses was 4150 pounds with a standard deviation of…

A: Given data,x=4150σ=480n=36z-value at 99% confidence is Zc=2.576

Q: what would the 95% confidence limits for a sample of 120 with a mean of 51 and a standard deviation…

A: It is given that mean and standard deviation are 51 and 12, respectively.

Q: A study was conducted to determine the effectiveness of hypnotism on reducing pain. Using standard…

A: Sample 1(before hypnosis): n1=8x¯1=8.713s1=2.177 Sample 2(after hypnosis): n2=8x¯2=5.588s2=2.608

Q: Find the Confidence interval for the true Population Mean if a sample of 50 has a mean of 26.8 and a…

A:

Q: Find the critical t value to use in making a 90% confidence interval for a mean if the sample size…

A: Given, confidence level = 90.0 Need to find Critical value t

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

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 101.7 and a standard…

A: GivenMean(μ)=101.7standard deviation(σ)=16.8

Q: 7 min and a standard deviation of 22.4 min. Assume that the 22 sample values appear to be from a…

A: The random sample of 22 values; n=22 The mean wake time 78.7 and standard deviation 22.4 x=78.7…

Q: A study analyzed the body fat percentage of 80 ISU students. The sample mean was 23.70 and the…

A:

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: What is the type of test you will use? (z-test, single-sample t-test, paired-samples t-test, or…

A: to find A). What is the type of test you will use? (z-test, single-sample t-test, paired-samples…

Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: A government board examination has a mean score of 500 points. A review school promises improved…

A: Let μ denotes the population mean score. The government board examination has a mean score of 500…

Q: sample of 37 inchworms in Cititon Park was collected and measured. Their lengths had a mean of 2.56…

A: Given:  Sample size n=37  Sample mean(xbar) x¯ =2.56  Standard deviation( ?)=0.09  To find 95%…

Q: A survey of 97 random homeowners in my neighborhood had a mean of $720 spent on lawn care. Construct…

A:

Q: If the sample size (n) and probability of success (p) are given, which equations are used to…

A: 1) Given,Sample size = n (fixed)Probability of success = p (for each trial).So, probability of…

Q: A random sample of 17 snowmobiles was selected, and the lifetime of the battery was measured. The…

A: