The manager of a large company claims that the standard deviation of the time (in minutes) that it takes a telephone call to be transferred to the correct office in her company is 1.2 minutes or less. A sample of 15 calls is selected, and the calls are timed. The standard deviation of the sample is 1.8 minutes. At alpha= 0.01, test the claim that the standard deviation is less than or equal to 1.2 minutes. Required: Test Value Note: Only the final answer should be rounded-off to TWO decimal places.

Q: For a population with u = 34, a score of X = 31 corresponds to z = -1.00. The standard deviation for…

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Q: Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509…

A:

Q: ssume that the Richter scale magnitudes of earthquakes are normally distributed with a mean of 1.157…

A: Given that μ=1.157 & σ=0.532

Q: A sample has a mean M = 55. In the sample, a score of X = 48 corresponds to z = -1.20. What is the…

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

A: Answer - A normal distribution with mean μ= 0  and σ = 1               Find P86,    the 86-…

Q: cores for men on the verbal portion of the​ SAT-I test are normally distributed with a mean of 509…

A: The mean is 509 and the standard deviation is 125.

Q: In a​ country, the mean time served by prisoners released from prison for the first time is 31.5…

A: Mean time = 31.5Standard deviation = 16.3

Q: You are a correctional officer interested in whether the 45 children in your juvenile facility have…

A: Given information- Population mean, μ = 10 per year Sample size, n = 45 Sample mean, x-bar = 14 per…

Q: A population of scores has μ = 80. In this population, a score of X= 92 corresponds to z = 5. what…

A: Given: μ = 80 z = 5 X= 92

Q: Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of…

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

A: The provided information is as follows:The random variable  is readings at freezing on a batch o…

Q: During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard…

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Q: the average grade is 84 with a standard deviation of 4. What is each grade for -1 2 0 1.5 -1.25

A: Given Mean μ=84Standard deviation σ=4 The formula for Z score isZ=X-μσX=Z×σ+μ

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A: Given Information: Hypothesized mean μ0=55 milligrams. Sample size (n) = 30 Sample mean (x¯) = 53.2…

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

A: From the given information, the readings at freezing on a batch of thermometers are normally…

Q: A population has a mean of 17 with a standard deviation of 2. A sample of 50 items from that…

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Q: A given set of data has an average of 25, and standard deviation of 5. Use this information to…

A: From the provided information, Average (µ) = 25 Standard deviation (σ) = 5 X~N (25, 5)

Q: Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone…

A: Before finding the P-value, calculate the test statistic:

Q: Suppose baby kittens' weights have a mean of 11.6 and a standard deviation of 1.5. The z-score tells…

A: Ans#- Given,          Mean μ = 11.6  and Standard deviation σ = 1.5         Use formula  z = x - μσ…

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

A: Given that  Mean = M = 0 , Standard deviation = SD = 1 X ~ Normal (M = 0 , SD = 1)

Q: Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the…

A: Given data mean=69.0 inches standard deviation=2.8 inches x=79.7 inches

Q: planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of 100…

A: On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of…

Q: The average (or mean) amount of hours spent on social media per day is 2 hours and the standard…

A: Given that, The random variable X is the number of hours spent on social media per day. The average…

Q: A certain slope at a ski resort records the time it takes for skiers to ski the entire trail. It…

A: Given, mean is 8.3 and standard deviation is 2.5 minutes.

Q: On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of…

A: The provided information are: Population meanμ=112Standard deviationσ=17 Consider X be a random…

Q: The mean 1Q score of adults is 90, with a standard deviation of 10. Use the Empirical Rule to find…

A: Given data: Mean =  90 Standard deviation = 10 To find: By using the Empirical Rule to find the…

Q: The standard deviation in the pressure required to open a certain valve is known to be o=1.2 psi.…

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Q: A group of students takes the Kaplan course in hopes that it will improve their SAT scores on the…

A: The national mean SAT score, μ=500.The population standard deviation of SAT scores, σ=100.The sample…

Q: a population of scores has u=44. in this population a score of x=40 corresponds to z = -1.00. What…

A: We have given that, Population mean (u) = 44, raw score of population (X) = 40 and z- score = -1. 00…

Q: A population of scores has µ=44. In this population, a score of X= 40 corresponds to z= - 0. 50.…

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Q: Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone…

A: The test hypotheses are:Null hypothesis:H0: μ = 4.7.Alternative hypothesis:H1: μ ≠ 4.7.