is there evidence that the mean life is different from 7520 hours?   What is the test​ statistic?   ZSTAT=enter your response here ​(Round

Q: The number of ants in a group is normally distributed with a mean of 67.0 and a standard deviation…

A: Let X be the random variable for the number of ants in a group. Given that, X~N(μ=67.0, σ=83.64)…

Q: The amount of corn chips in a 16 - ounce bag by the dispensing machine has a normal distribution…

A: It is given that mean is 16.5 and standard deviation is 0.2.

Q: The weights of newborn baby boys are normally distributed with a mean of 3.33 kg and a standard…

A: GivenMean(μ)=3.33standard deviation(σ)=0.40

Q: Find the time it takes the fastest 24.2% of the college students to find a parking spot in the…

A: The length of time it takes college students to find a parking spot in the library parking lot…

Q: he fill volume of cans filled by a certain machine is normally distributed with mean 12 oz and…

A: Z be the standard normal distribution Where as, Z = (X-µ)/σ  Now in above mean (µ)  = 12 and…

Q: The systolic blood pressure of 19-year-old women is normally distributed with a mean of 120 mmHg and…

A: According to the empirical rule,

Q: A student received a grade of 82 on an exam in a large course. Standardizing this mark gave the…

A:

Q: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a…

A: Given Mu=63 Standard deviations=5

Q: A vending machine dispenses coffee into a twenty-ounce cup. The amount of coffee dispensed into the…

A: A vending machine dispenses coffee into a twenty-ounce cup. The amount of coffee dispensed into the…

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Given that Mean = 6.9 and Standard deviation = 1.5 Formula z = (x - mean)/ SD

Q: The state of California had a mean annual rainfall of 23 inches and a standard deviation of 4…

A: Answer: From the given data, Let X denotes the mean annual rainfall of California Here, X is…

Q: According to National Health Survey heights of men are normally distributed with mean of μ=69.0…

A: The standard deviation is obtained below Critical value: From the standard normal distribution…

Q: The nails produced by a machine are assumed to have a mean of 5.0 cm. A random sample of 80 nails…

A: Null hypothesis: H0: µ=5. Alternative hypothesis: H1:µ>5. This is a right tailed test. Here, the…

Q: Steel rods are manufactured with a mean length of 25 centimeters (cm). Because of the variability in…

A: Given, Steel rod length are normally distributed with mean 25 cm and standard deviation 0.07.

Q: Vhich distribution is used to construct an interval estimate of a population standard deviation?

A: Which distribution is used to construct an interval estimate of a population standard deviation?

Q: The heights of a pediatricians three-year-old females are approximately normally distributed, with…

A:

Q: Steel rods are manufactured with a mean length of 27 centimeter​ (cm). Because of variability in the…

A: Given,mean(μ)=27standard deviation(σ)=0.06

Q: Netflix: A study conducted by a technology company showed that the mean time spent per day browsing…

A: Sample size (n)=109Sample mean =21.6Population mean =20.6Standard deviation =7Test hypothesis: Claim…

Q: The effect size is a measure of the magnitude of a treatment effect in standard deviation units.…

A: Given that, The effect size is a measure of the magnitude of a treatment effect in standard…

Q: Fluorescent lightbulbs have lifetimes that follow a normal distribution, with an average life of…

A: Solution: From the given information, σ=1,612 hours and n=332.

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Introduction: Denote the random variable, Denote X as the number of hours of sleep on a weeknight.…

Q: A dataset has a mean of 48.1 and a standard deviation of 6.3. What is the z-score of the value 18.5,…

A: Solution  Given That, A dataset has a mean of 48.1 and a standard deviation of 6.3. What is the…

Q: Assume that women have heights that are normally distributed with a mean of 63.6 inches and a…

A:

Q: In a recent study of 35 Grade5 students, the mean number of hours per week that they played video…

A: We know that,  Sample size (n) = 35, sample mean (x̄) = 16.6 and population standard deviation (σ) =…

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Given Let X : The average hours of sleep on a weeknight mean = μ= 6.9  standard deviation = σ= 1.5…

Q: Assume that the heights of women are normally distributed with a mean of 65.4 inches and a standard…

A: We have given that  Mean=μ=65.4 Standard deviation=σ=2.7 X~Normal(μ=65.4,σ=2.7)

Q: The mean SAT verbal score is 473, with a standard deviation of 96. Use the Empirical Rule to…

A:

Q: Sketch the distribution of heights. What percentage of students are over 73.38 inches tall? What…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: e diameters of Douglas firs grown at a Christmas Tree Farm are normally distributed with a mean of 4…

A: GIVEN DATA, normal distributionμ=4σ=1.5we have to find out the given probabilities.

Q: The mean gas mileage for cars driven by the students at Chillville High School is 28.0 miles per…

A:

Q: Square footage of homes are normally distributed with a mean of 1,200 square feet and a standard…

A: Square footage of homes are normally distributed with a mean of 1,200 square feet and a standard…

Q: A grocery store's sales experience indicates that its daily apple sales follow a normal distri-…

A: (b) Obtain the cut off point for the top 10% of all daily apple sales. The cut off point for the top…

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: The director of research and development is testing a new medicine. She wants to know if there is…

A: Assume that μ is the true average time the medicine relives pain.

Q: · For 500 readers polled, how many people read in between 18 and 22 minutes a day? . For 25,000…

A:

Q: The average age of cars on the road in the United States follows a normal distribution with a mean…

A: The random variable age of car follows normal distribution. The population mean is 11.9. The…

Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A: The population standard deviation is 92 hours.

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Let, X= The number of hours of sleep on a weeknight. μ=6.9, standard deviation=σ=1.5 We want to…

Q: A taxicab company in New York City analyzed the daily number of miles driven by each of its drivers.…

A: It is given that the number of miles driven is normally distributed with mean 200 miles and standard…

Q: Steel rods are manufactured with a mean length of 28 centimeters. because because of variability in…

A: Answer:- Given, Mean, µ = 28  Standard deviation, σ = 0.06  Let, X = Length of the steel rods.  So,…

Q: Assume that the mean amount of coffee dispensed is 6 ounces and a standard deviation is 0.5 ounce…

A: