University of Michigan provides a quarterly measure of consumer opinions about products and services. A sample of 40 restaurants in the Fine Dining group showed that the average rating was an 85. Past data indicate that the population standard deviation for fine restaurants is relatively stable, with sigma = 4. Calculate a 99% confidence interval for the population mean index for this type of restaurants.

Q: The grade point average of students at a university is normally distributed, with a mean of 2.6 and…

A:

Q: Since 2007, a psychological association has supported an annual nationwide survey to examine stress…

A:

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 standardized measure of achievement motivation is modeled by a normal distribution with a mean of…

A: Obtain the achievement score The achievement score is obtained below as follows:

Q: A random sample of 51 four-year-olds attending day care centers provided a yearly tuition average of…

A:

Q: A parent interest group is looking at whether birth order affects scores on the ACT test. It was…

A: We want to tell you alternative hypothesis

Q: A random sample of 92 checking accounts at a bank showed an average daily balance of $311. The…

A: GivenSample size (number of accounts) n = 92Sample mean (average daily balance) = $311Population…

Q: Suppose, according to a 1990 demographic report, the average U. S. household spends $90 per day.…

A:

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: Step 3 of 3: Draw a conclusion and interpret the decision. Answer Tables E Keypad Keyboard Shortcuts…

A: Given Data : For first born children x̄1 = 24.4 σ1 = 1.5 n1 = 225 For…

Q: In 2002, the mean age of an inmate on death row was 40.7 years with a standard deviation of 9.6…

A: Solution

Q: Gasoline prices reached record high levels in 16 states during 2003 (The Wall Street Journal, March…

A: Given Information: California: Sample size n1=40 Sample mean x¯1=2.04 Population standard deviation…

Q: A parent interest group is looking at whether birth order affects scores on the ACT test. It was…

A:

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: A sociologist claims that mean height of all adult women in Smallville is more than 64 inches. In a…

A: Given data is appropriate for testing of hypothesis for testing z-test for single mean. Because it…

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 sample of 22 public high school students spent an average of 6.5 hours studying per week. Assuming…

A:

Q: A popular weight loss program claims users will lose weight each month. Linda samples 25 dieters and…

A: We have given that,  Sample mean (x̄) = 10 pounds, standard deviation (s) = 2 pounds and sample size…

Q: A survey of credit card holders revealed that Americans carried an average credit card balance of…

A: M1=$3900M2=$3300n1=400n2=450σ1=$880σ2=$810

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

A:

Q: Marketing analysts for a juice manufacturer conducted a survey in a large town. They determined that…

A: Population standard deviation : Sample size : Sample mean : Construct 90 and 95% ci for

Q: A Statistics instructor wanted to compare the scores on the same final exam given to students at a…

A: We have given that  Sample sizes n1= 36 , n2= 45 ,xbar1=84 ,xbar2= 79 , s1= 3.4 ,s2=2.6  Confidence…

Q: A social scientist claims that the average adult watches less than 26 hours of television per week.…

A: The general formula for the test statistic is, z=x¯-μσn

Q: A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose…

A: Given, As per z-distribution table, the critical value of z at 0.05 level of significance is…

Q: A study by the National Center for Health Statistics suggested that women between the ages 20 and 29…

A: 0.33271Explanation:For the given normal distribution with μ=26.8 and σ=7.4, the required proportion…

Q: A parent interest group is looking at whether birth order affects scores on the ACT test. It was…

A:

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: Average adult Americans are about one inch taller but nearly a whopping 25 pounds heavier than they…

A: According to the given information in this question We need to apply z test for one population mean

Q: Assume that the population has a normal distribution.  A laboratory tested twelve chicken eggs and…

A: It is given that sample mean is 185 and standard deviation is 17.6.

Q: In a population of 100 male fruit flies, the mean abdomen length is 2.0 mm and the standard…

A: Given  μ=2 and σ=0.3 Use standardization as z=x-μσ

Q: Bone mineral density (BMD) is a measure of bone strength. Studies show that BMD declines after age…

A: The difference in mean between two groups can be given as can be given from the unpaired t-test. The…

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: A study shows that Michigan teachers have measures of job dissatisfaction that are normally…

A: