Use the confidence level and sample data to find a confidence interval for estimating the population . Round your answer to teh same number of decimal places as the sample mean.  9) A random sample of 105 light bulbs had a mean life of x bar = 441 hours, with a standard deviation of 40 hours. Construct a 90% confidence interval for the mean life, (mu), of ALL light bulbs of this type.

Q: The quality-control manager at a light bulb factory needs to determine whether the mean life of a…

A: Given,sample size(n)=64sample mean(x¯)=350Population standard deviation(σ)=100

Q: ample of 3000 persons were surveyed for their walght in pounds, the mean weight is 135 lbs with a…

A:

Q: Score 15- 12- 6. 0. 9. 8. 9. 10 11 12 Ico 6. 3. Frequenoy

A: Form the given graph we have to find the standard deviation

Q: Use z scores to compare the given values.   The tallest living man at one time had a height of 249…

A: Given that: Population mean, μ=174.45 Population standard deviation, σ=6.75 Height of tallest man,…

Q: A successful basketball player height is 203 cm. His converts to the z score of 4.10. How many…

A: Consider, X = 203  z-score = 4.10 z-score is a numerical value that tells the number of standard…

Q: tallest living man at one time had a height of 245 cm. The shortest living man at that time had a…

A: Given that  The tallest living man at one time had height = 245cm The shortest living man that time…

Q: Use z scores to compare the given values. The tallest living man at one time had a height of 242 cm.…

A: Thus, the standard z-score for the tallest man is 10.51.

Q: 1) Z-SCORE. Which has a better relative position: a score of 75 on a statistics test with a mean of…

A: HI, we are supposed to answer one question at a time. Since you have not mentioned which question to…

Q: ng man

A: Given that Tallest living man height (X1) = 238 Mean Heightμ=176.25 Standard deviationσ = 6.32 Z…

Q: The mean score on the ACT test was 23.7 and the standard deviation was 5.8. The distributions of…

A: Given: Mean = μ = 23.7 Standard deviation = σ = 5.8

Q: What is the Z value for a value of X = 60?

A:

Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Given that ,                    sample size n=100                    Mean u=80…

Q: the data set has a size 50, how many observations lie within 2 standard deviations of the mean

A: From the provided information, Sample size (n) = 50 The observations lie within 2 standard…

Q: Use z scores to compare the given values. The tallest living man at one time had a height of 247 cm.…

A: Given information- Population mean, µ = 177.86 cm Population standard deviation, σ = 6.69 cm Height…

Q: The mean grade on a final examination was 72 and the standard deviation was 9. The top 10% of the…

A: Mean(µ) = 72Standard deviations (σ) = 9

Q: Analyze the mean and standard deviation for the above data. This analysis must be not less than 200…

A: Mean, which is also known as the average, is used to derive the central tendency of the data. It can…

Q: A simple random sample of 64 observations was taken from a large population. The sample mean and the…

A:

Q: The IQ score that separates the bottom 15% from the top 85% is P,5 =. (Round to the nearest…

A:

Q: Use z scores to compare the given values. The tallest living man at one time had a height of 258 cm.…

A: It is given that the height of tallest man is 258 cm and the height of shortest man is 123.4 cm. The…

Q: A population has mean 27 and standard deviation 12 . What is the data value that has a z-score of -2…

A: Given data, Mean=27 sd=12 z=-2 x=?

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard…

A: Given: Population mean (µ) = 100 Population standard deviation (σ) = 15

Q: A successful basket ball player has a height of 6 feet 4 inches. Based on statistics his height…

A: As given, The basketball player has a height of 6 feet 4 inches and when his height is converted to…

Q: Assume that a data for pulse rates of 50 participants is ollected. The mean pulse rate has the mean…

A: Range rule of thumb: The values are significant if it is lies within 2 standard deviations away from…

Q: Smelt is a type of flood fish. Smelt lengths are normally distributed with a mean of 15 cm and a…

A: Given: µ = 15 σ = 1

Q: o these calculations using Excel, a graphing calculator, or an app. Type the data in different…

A: The number of observations is 6.

Q: You perform a one-sample t test and calculate a t statistic of 3.0. The mean of your sample was 1.3…

A:

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A: Solution: Let X be the readings at freezing on a batch of thermometer. From the given information, X…

Q: Assume that a randomly selected subject is given a bone density test. Bone density test scores are…

A: Assume that a randomly selected subject is given a bone density test. Bone density test scores are…

Q: As an electrical engineer, you have designed a new efficient light bulb. In order to predict its…

A: Formula  Used: Mean X = ∑FX∑F Standard deviation = ∑FX2-nX2∑F-1

Q: The standard deviation of SAT scores is 100 points. A researcher decides to take a sample of 500…

A: Given that SD = 100 Sample size n = 500

Q: The mean score on the ACT test was 19.3 and the standard deviation was 5.4. The distributions of…

A: The z-score of a random variable X is defined as follows: z = (X – µ)/σ. Here, µ and σ are the mean…

Q: Use z scores to compare the given values.   The tallest living man at one time had a height of 239…

A: Suppose random variable x defines the height of a man.

Q: In a study 10 people were given a test. The mean test score was 78.9 points. The standard deviation…

A: Given: Sample size n = 10 Sample mean X = 78.9 Sample standard deviation s = 5.2 Formula Used: X =…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Let X: the length of trout caught in Pyramid LakeGiven that,Mean length(μ) = 19 inches.Sample…

Q: Find the mean, standard deviation, and relative standard deviation for the set of measurements (7,…

A: Mean: The mean value is calculated as follows: The sum of the observations is divided by the number…