How large a sample should you take to be 95% confident that the estimate of the true mean number of hours of sleep among adults will differ by no more than 0.30? A previous study showed a sample standard deviation of 1.95 minutes. at most 136 B at least 136 C at most 163 D at least 163

Q: The data set has size 60. Approximately how many observations lie within three standard deviations…

A: From the empirical rule

Q: A population has mean 49 and standard deviation 5. What is the data value that has a z-score of 2?…

A:

Q: An article the Journal of the American Medical Association (1992) examined whether the true mean…

A: From the provided information, Sample size (n) = 25 Sample mean (x̅) = 98.25oF Sample standard…

Q: For a sample of 300 students, you find that the mean GPA is 3.35 with a standard deviation of .21.…

A: Solution: From the given information, Standard deviation is 0.21 and n=300.

Q: You are given the following information for a sample (mean = 40; standard deviation = 10). What is…

A: According to the provided information:

Q: How large a sample is needed to estimate the population mean for the amount of money a person spends…

A: Determine the sample size needed. Use EXCEL Procedure for finding the critical value of z.   Follow…

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

A:

Q: s known that o = 2.15 pounds. %3D sample should be taken to be 93% confident that the sample mean is…

A: The sample size can be calculated as: n=z×σE2 Here, z = desired confidence level E = The allowable…

Q: A statistician uses Chebyshev's Theorem to estimate that at least 90 % of a population lies between…

A: We have to find correct answer for given data..

Q: A successful basketball player has a height of 6 feet 4​inches, or 193cm. Based on statistics from a…

A: The z-score identify that the value how many standard deviations from the mean. If the z-score is…

Q: Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest…

A: (a) Determine the difference between carrier’s highest data speed and the mean of all 50 data…

Q: In a normally distributed data set of how long customers stay in your store, the mean is 43.5…

A: Given data Mean μ = 43.5 Standard deviation σ = 3.9 95% of your customers to stay in your store.…

Q: Assume you have taken 125 samples of size 81 each from a population. The population variance is 64.…

A:

Q: Use z scores to compare the given values.   The tallest living man at one time had a height of 225…

A: Given that  The tallest living man at one time had a height of 225 cm. The shortest living man at…

Q: A population of scores has u=55 and o=15.  if 5 points are subtracted from every score in the…

A: The given data is μ = 55σ = 15 Suppose x1, x2, x3, x4, ..., xn are the data points…

Q: A simple random sample of 144 observations was taken from a large population. The sample mean and…

A: sample mean is given by, x = 120.8 and sample standard deviation is given by, s = 32.46 Number of…

Q: For a random sample of 55 overweight men, the mean of the number of pounds that they were overweight…

A: Given data, n=55 μ=32σ=4.1Point estimate μx=?

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: The standard deviation of a data set is zero. This means that a. All the values are equal to zero b.…

A:

Q: A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that…

A: Point Estimate:   The Point estimate of the population mean is the sample mean.

Q: The data set has size 90. Approximately how many observations lie within two standard deviations…

A: The Empirical Rule states that 99.7% of data observed following a normal distribution lies within 3…

Q: The average number of days spent on the road for business by business travellers is 115 per year.…

A:

Q: Given a set of data that is skewed-right, there is at least _____ % of the data within 2 standard…

A:

Q: If 66,500 duracell batteries are manufactured, approximately how many of those batteries

A: Here Given  The life span of Duracell batteries is normally distributed. The mean life span is…

Q: The data set has size 80. Approximately how many observations lie within two standard deviations to…

A: Empirical rule: On a normal distribution about 68% of data will be within one standard deviation of…

Q: Use z scores to compare the given values.   The tallest living man at one time had a height of 245…

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