2. om/courses/27596/assignments/525855 Download Page ( 2. A random sample of 12-ounce milkshakes from 14 fast-food restaurants had the following mumber of calories. Assume the population standard deviation is o= 90. a) Explain why it is necessary to check whether the population is approximately normal before constructing a confidence interval. b) Following is a dotplot of these data. Is it reasonable to assume that the population is approximately normal? f appropriate, construct a 92 confidence interval for the mean number of calories for all 12-ounce milkshakes sold at fast-food restaurants If not appropriate, explain why not. Step 0 Identify the following Step 1: Find the value of the point estimate R, if it in't given. Step 2: Find the critical value z,, corresponding to the desired confidence lavel with rechnolorN Step 3: Find the margin of error Step 4 Use the point estimate and the margin of error to constrruct the confidence interval Point estiniate Alargin of error a. +66 立。

Q: the claim that the mean breaking strength has increased

A: Given : n=18 , X-bar=1919  , σ=70 , μ0=1875 , α=0.01 We want to test the claim that an improvement…

Q: 2) Sample mean can be used to make estimations of population mean. Considering the following…

A: We have given that Population Standard deviations (σ) = 11 Sample size (n) = 100 Sample mean (x̅) =…

Q: We study endurance in marathon runners and sprinters. We calculate a z-score for the difference…

A: Introduction Hypothesis is an assumption that is being tested.

Q: questions: a. How many times would we expect about 68% of students to check thier Facebook? b. What…

A: It is given that  Mean, μ = 12 Standard deviation, σ = 3

Q: The ages of a group of 135 randomly selected adult females have a standard deviation of 16.2 years.…

A: We have given that  Standard deviation =sigma =16.2 Margin of error =E= 1.5 99% confidence.

Q: The breaking strengths of cables produced by a certain manufacturer have a mean, H, of 1925 pounds,…

A: GivenMean(x)=1955standard deviation(s)=75sample size(n)=24Significance level (α)=0.05

Q: In a test of the effectiveness of garlic for lowering cholesterol, 48 subjects were treated with…

A: The sample size is 48, the sample mean is 3.2 and the standard deviation is 17.8.

Q: The data attached are the systolic blood pressure of 10 subjects collected before and after…

A: The systolic blood pressure of 10 subjects collected before and after exercise.

Q: Millionaires. Professor Thomas Stanley of Georgia State University has surveyed millionaires since…

A:

Q: According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft,…

A: The independent variable is percentage of all complaints that are complaints of identity theft in…

Q: Response to allergen inhalation in allergic primates. In a study of 12 monkeys, the standard error…

A: From the provided information, Sample size (n) = 12 Standard error (SE) = 0.4

Q: In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta…

A: The following information is provided:

Q: n article in the San Jose Mercury News stated that students in the California state university…

A: (1) Given: s =1.2 The degrees of freedom is, Df =n-1=38-1=37 The critical t-value corresponds to…

Q: One of the lines of pharmaceutical company produces oxygen tanks for breathing. The company is…

A: When the given value is less than 30, or in the given information, if the sample standard deviation…

Q: Suppose pizza delivery times are normally distributed. The population standard deviation is 7…

A: Given: Population standard deviation σ = 7  minutes. Sample mean X = 36 minutes. Sample size n = 20…

Q: A sample of 14 commuters in Cebu showed the average of the commuting times was 33.2 minutes. If the…

A: Sample size : n=14 Sample mean : x¯=33.2 Sample standard deviation : s=8.3 Confidence level :…

Q: The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours.…

A: Given data,x=44.6σ=23n=70z-value at 90% confidence is Zc=1.645

Q: Your medical research team is investigating the standard deviation of the cost of a​ 30-day supply…

A:

Q: For a 4-units class like Statistics, students should spend average of 12 hours per week studying for…

A: Mean (x̅) = 13 hoursStandard deviation (s) = 3 hoursThe empirical rule, also known as the 68-95-99.7…

Q: na random sample of twelve people, the mean driving distance to Work Was 24. ormally distributed and…

A: Given Xbar=24.7 S=5.5

Q: a) Find the 95% confidence interval for the mean pulse rate of all U.S. adult males who jog at least…

A: Given that  Sample size = n = 21

Q: You may need to use the appropriate appendix table or technology to answer this question. Sales…

A:

Q: 5. An experiment was conducted to compare the vinegar content of salad dressing on two different…

A: Given: Sample size = n1 = n2  = 10 Sample variance s12=2.0 Sample variance s22=0.4 Confidence level…

Q: What are the confidence intervals for: Mean= 1020 Sd= 30 N=300 α= .01

A: We have given that  Mean= 1020 Sd= 30 N=300 α= .01

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A: It is given that the mean and standard deviation are 12 and 3.4, respectively. The sample size n is…

Q: According to a study, brain weights of men in country A are normally distributed with mean 1.56 kg…

A: It is given that the mean is 1.56 and the standard deviation is 0.12.

Q: Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made…

A: n=55,X¯=19.5,s=5.3

Q: 4. Overproduction of uric acid in the body can be an indication of cell breakdown. Over a period of…

A: Given information Sample size n = 8 Sample mean x̅ = 5.35 mg/dl Population standard deviation σ =…

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A:

Q: 18. Obesity Obesity is defined as a body mass index (BMI) of 30 kg/m² or more. A 95% confidence…

A: Given Data : Lower limit = 0.224 upper limit = 0.235

Q: A company is doing a hypothesis test on the variation in quality from two suppliers. Both…

A: Given , Supplier 1 : Sample size = n1 = 31 Sample standard deviation = s1 = 4.0623 Supplier 2 :…

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: Given information- Population mean, μ = 11 years Sample size, n = 85 Take significance level, α =…

Q: If a variable has a  very small standard deviation, and the outcomes of the variable will... a.…

A: Standard Deviation: Standard deviation measures how dispersed your data in from the mean.

Q: Approximately of housing prices are between a low price of _ and a high price of _ .

A: Housing prices in a small town are normally distributed with a mean of 153,000 and a standard…

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: Suppose a random sample of adult women has a sample mean height of x¯=64.3 inches, with a sample…

A: From the Empirical rule, we know that 99.7% fall within three standard deviations from the mean.…

Q: It is known that the population mean for the verbal section of the SAT is 500 with a standard…

A: From the provided information, Sample size (n) = 400 Sample mean (x̅) = 511 Population standard…

Q: Consider a dataset containing the heights of 38 females who said they prefer to sit in the front of…

A: Givensample size(n)=38Mean(x)=62standard deviation(s)=2.5significance level(α)=10%=0.10The null and…