In a random sample of 8 cell​ phones, the mean full retail price was ​$521.70 and the standard deviation was ​$185.00. Further research suggests that the population mean is ​$431.01. Does the​ t-value for the original sample fall between −t0.99 and t0.99​? Assume that the population of full retail prices for cell phones is normally distributed.

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: According to one study, the average hours of sleep on a weeknight for men was 6.9 hours with a…

A:

Q: Suppose the heights of 10-year-old boys in the US vary according to a normal distribution with a…

A: The objective of this question is to find the percentile of a boy with a height of 140 cm given that…

Q: The tread life of a certain brand of tires is known to be normally distributed with a mean of 40,000…

A: From the provided information, Mean (µ) = 40000 miles Standard deviation (σ) = 2000 miles X~N…

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

A:

Q: It is estimated that amounts of money spent on gasoline by customers at a gas station follow a…

A: Given info: amounts of money spent on gasoline by customers at a gas station follow a normal…

Q: Es On their website, a property management company states that the mean monthly rent for apartments…

A: As per bartleby guideline expert have to answer first three subparts only dear student please upload…

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 63.8 inches.…

A: Given data,μ=63.8σ=2.51If n=28P(X≥65.08)=?

Q: The speeds of all cars on the tollway was found to be normally distributed with a mean of 63 miles…

A: It is given that that µ=63 mile per hour. Obtain the standard deviation of the speeds of all cars:

Q: The life of a battery is normally distributed with mean 70 hours with a standard deviation of 10…

A: Given, μ = 70 σ = 10 Z = X-μσ

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: health economist does a study on the average life expectancy of every country in Europe.  The…

A: Given, mean life of the country is 81.2 and standard deviation is 3.7. Z-score is 1.2. We will use…

Q: The daily income of bank auditors in SSS Commercial Bank is normally distributed with a mean of P675…

A: Given

Q: In a survey sample of 1000 respondents, the mean annual salary is $32,245, with a standard deviation…

A: Solution: Given information: n= 1000 Sample size  x= $32245  Sample mean  s=$4021.54  Sample…

Q: Steve believes that his wife’s cell phone battery does not last as long as his cell phone battery.…

A: From the given information,

Q: Assume that adults have IQ scores that are normally distributed with a mean of 97.3 and a standard…

A: Given data Mean μ= 97.3 Standard deviation ? = 22.8 First quartile is given by Probability = 0.25

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

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 age of customers for a particular retail store follows a normal distribution with a mean of 37.5…

A: Given Mean=37.5 Standard deviation=7.6

Q: A survey was conducted to determine the difference in the average height of adult males before and…

A:

Q: The middle 55% of jobs should be within what range of times?

A: here given, mean = 50 minute standard deviation  = 6 minute

Q: The battery of cellphones tend to work less efficiently the longer you have your phone and…

A: We have given that the cellphone battery life follows a normal distribution with a mean of 3 years…

Q: Steve believes that his wife’s cell phone battery does not last as long as his cell phone battery.…

A: Method By using the 90% confidence level to construct a confidence interval.

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

A:

Q: A candy store sells about 8 million pieces of candy per day with a standard deviation of 300,000…

A: Given : Let X : Number candy that they sell in a given day           μ = 8 million i.e   Mean (μ) =…

Q: Find a 90% interval estimate of the mean daily time spent on rigorous exercise by all employees.

A: From a random sample of 25 employees, the mean time spent on vigorous daily exercise was 28.5…

Q: Assume the annual day care cost per child is normally distributed with a mean of ​$9000 and a…

A:

Q: Suppose that the life-span of goldfish can be modeled by the Normal Distribution with a mean of 5…

A:

Q: fitness center is interested in finding a 95% CI for the mean number of days per week that Americans…

A: Given: Xˉ=3.2 s=2.6 n=248  Confidence level = 95% As the population standard deviation is not known,…

Q: The length of pregnancies are normally distributed with mean of 268 days and a standard deviation of…

A: Given : Length of pregnancies = X  X is normally distributed  Mean of X = 268 days  Standard…

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 64.7 inches.…

A: Given that: X is normal Distributed with mean µ = 64.7 and standard deviation σ = 2.88 By using…

Q: a life time of a certain brand of tires is approximately normally distributed with a mean of 42,500…

A: Given information- Population mean, µ = 42,500 miles Population standard deviation, σ = 3200 miles…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

Q: Assume that the hourly cost to operate Saint-Martin Hyundai bus follows the normal distribution with…

A:

Q: Steve believes that his wife's cell phone battery does not last as long as his cell phone battery.…

A:

Q: A banker finds that the number of times people use automated-teller machines (ATMs) in a year are…

A: The mean is 40 and the standard deviation is 11.

Q: Draw the normal curve. Suppose that the amount of time it takes the Bureau of Internal Revenue…

A: Solution-: Given: μ=14,σ=1.5 We want to find x such that, P[X<x]=0.45

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…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.