A random sample of 10 chocolate energy bars of a certain brand has, on the average 230 calories with known population standard deviation of 15 calories. Construct and interpret a 80% confidence interval for the true mean calorie content of this brand of energy bar. Assume that the distribution of calories is approximately normal.

Q: Wheel thickness on a train is random because wear and tear causes the wheel to wear down. The…

A: We have given that,  Sample mean or average (x̄) = 8.29, standard deviation (σ) = 0.52 and sample…

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

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Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

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Q: adway Section 40 has an accident rate of 230 accident per 100 million vehicle miles VM). The mean…

A: We have given that  Sample size n = 230 Sample mean = 94 Standard deviation = 70 90 % confidence…

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: F AN INDIVIDUAL. SUPPOSE THAT A RANDOM SAMPLE OF 45 MALE FIREFIGHTERS ARE TESTED AND THAT THEY HAVE…

A: A random sample of male firefighters' data is given below: Mean 37.5 Standard Deviation 7.5…

Q: Assume that 28% of randomly selected adults have high cholesterol (with a level of at least…

A: From the given information, Sample size(n) = 5 Probability of success (P) = 0.28 Consider, x be a…

Q: A sample of 14 cans of Brand A diet cola gave the mean number of calories of 23 per can with a…

A: From the provided information,The hypotheses are:The mean numbers of calories are not different.The…

Q: A sample of 13 concerts showed their average noise levels were 82 decibels and their standard…

A: Solution: Let X be the noise level From the given information, x-bar=82 decibels, s=7 decibels and…

Q: Assume a research wants to compare the mean Alanine Aminotransferase (ALT) levels in two…

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Q: ▾ Part 1 of A study is done to determine which of two soft drinks has more sugar. There are 21 cans…

A: From given data we have  n1=21  s1=0.6  n2=20  s2=0.3

Q: The time required for an automotive center to complete an oil change service on an automobile…

A: Obtain the length of the guaranteed time limit. The length of the guaranteed time limit is obtained…

Q: Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the lungs. Patients…

A: The hypothesized mean is as follows μ=306 The sample size is 50. n=50 The sample mean x¯=274 The…

Q: A random sample of 40 Americans yielded a sample mean of 67 gallons of carbonated beverages per…

A: We have given that,  Sample mean (x̄) = 67, Population standard deviation (σ) = 22 and sample size…

Q: Find a 90% confidence interval for the mean of a normal distribution if population variance is 4 and…

A: Given CL = 0.90 Population variance, σ2=4 Sample size, n=8 9,14,10,12,7,13,11,12

Q: x¯ = Margin of error at 90% confidence level = 90% confidence interval =

A: Given: n=8 Confidence level=90% Height, X 67 66 64 75 63 67 72 71

Q: The health of the bear population in Yellowstone National Part is monitored by periodic measurements…

A: Given that Sample size n = 54 Sample mean M = 182.9 And pioulation SD = 121.8 The critical value of…

Q: The amount of money spent on online foods by customers at an online restaurant follows a normal…

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Q: The distribution of study times for first-year students follows a normal distribution with a…

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Q: Dr. Moore wanted to estimate the mean cholesterol level for all adult men living in Hartford... He…

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Q: random sample of 15 students was selected from a population size of 100 (normal) in a certain…

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Q: A researcher makes a research about the life time of batteries which have a normal distribution. In…

A: From the given information, Sample size n =49 Sample mean, x̅=48 hours Sample standard deviation,…

Q: The age of managers in particular industry is normally distributed with mean μ=35. A group of 30…

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Q: Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the lungs. Patients…

A: The provided data is,

Q: find the 99% confidence interval of the mean number of miles driven per day by all truckers

A: It is given that  Average = 540 Population standard deviation = 40 Sample size = 90

Q: Response time is an important statistic for measuring the effectiveness of a fire department, and is…

A: Given data,Mean μ=4.5sd σ=1.2P(4<X<6)=?

Q: he mean number of English courses taken in a two-year time period by male and female college…

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Q: Does the data provide sufficient evidence to indicate a difference in the home sales prices between…

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

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Q: The mean diastolic blood pressure for a random sample of 70 people was 96 millimeters of mercury.…

A: given data  n = 70 x¯ = 96σ = 1190% ci for μ.

Q: Assume researchers are trying to find out the mean concentration levels of a specific drug in a…

A: Obtain the 95% confidence interval for the mean concentration level of the medication for the…

Q: A researcher collected sample data for 16 women ages 18 to 24. The sample had a mean serum…

A: Obtain the 90% confidence interval for the mean serum cholesterol level of all women in this age…

Q: Estimate and report the number of meals you eat out per week. Assume the standard deviation is known…

A: The number of meals eaten by 10 individuals of a class are reported as follows: Individual No. of…

Q: The mean number of the sample of 16 bolts produced on a specific machine per day was found to be 42…

A: Given: Size of sample =16 bolts sample mean = 42  sample standard deviation =2. Population is…