A shipping firm suspects that the mean life of a certain brand of tire used by its trucks is less than 30,000 miles. To check the claim, the firm randomly selects and tests 18 of these tires and gets a mean lifetime of 29,350 miles with a standard deviation of 1200 miles. At a = 0.05, test the shipping firm's claim. Round the test %3D statistic to the nearest thousandth.

Q: The average birth weight of elephants is 220 pounds. Assume that the distribution of birth weights…

A: Solution-: Given: μ=220,σ=50 We want to find the birth weight of elephants at the 90th percentile.

Q: A person in the U.S. eats about 25 pounds of M&M's per year with a standard deviation of 3 pounds.…

A: Given information Mean µ = 25 pounds Standard deviation σ = 3 pounds Z = -2

Q: Assume that the results are normally distributed. Pedro took an exam in a class in which the mean…

A: The formula for z-score is z = x - μσ where μ is the mean and σ is the standard deviation.…

Q: The weights of adult California Condors average 14.8lbs with a standard deviation of 3.25lbs.…

A:

Q: Round each z-score to the nearest hundredth. A data set has a mean of x = 218 and a standard…

A: Given , x = 218    , σ = 40 We know , z-score = x-xσ

Q: In a herd of longhern cattle the mean horn length is 52cm and h2 is 0.2. Predict the mean horn…

A: Heritability is a measure of additive effects of genes, it tells whether the observation variation…

Q: Scores on a test have a mean of 86 and a standard deviation of 13. Jerrica has a score of 94.…

A:

Q: The weights of men in their 30s are normally distributed with a mean of 190 pounds and a standard…

A: From the provided information, Population mean (µ) = 190 pounds Population standard deviation (σ) =…

Q: A basketball player has a scoring average of 0.325 each week of the season, with a standard…

A: Given: μ=0.325σ=0.065

Q: he mean length of one-year-old spotted flounder, in millimeters, is 124.8 with standard deviation of…

A: Given,μ=124.8σ=13.52P(X<x)=0.92x=?

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

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

A: Given Information: Mean μ=69.0 inches Standard deviation σ=2.8 inches. To find the z-score of a man…

Q: Fabienne found the standard deviation of the residuals to be 1.30. Explain this value in context.

A: The standard deviation of the residuals shows that how much the data points spread around the…

Q: The relative frequency histogram represents the length of phone calls on​ George's cell phone during…

A: A histogram is a visual representation of continuous data.

Q: The weight of newborn babies is normally distributed, with a mean of 3.3 kilograms and a standard…

A:

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: The average age of senators in the 108th Congress was 60.5 years. If the standard deviation was 13.5…

A:

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: Each year students in a local school district write a national examination. The average on this…

A: Average of a dataset is the mean value of the observations in the data and it is computed by…

Q: The weight of newborn babies is normally distributed, with a mean of 3.7 kilograms and a standard…

A: GivenThe weight of new born babies are normally distributed.The mean =3.7 KgThe standard deviation…

Q: 2. The ages of the 189 people were recorded in a clinical study. The data have been partially…

A: The given data is as follows,…

Q: The mean life of a battery is 55 hours with a standard deviation of 6 hours. The manufacturer…

A:

Q: A sample of 14 television tubes produced by a company showed a mean lifetime of 1838 hours and a…

A: Given that, n=14σ=233x¯=1838 The formula for calculating the standard deviation of the population of…

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

Q: Scores on a test have a mean of 8181 and a standard deviation of 1313. Michael has a score of 9393.…

A:

Q: The amount of sodium was measured for a sample of 30 different breakfast cereals.  The sample mean…

A: Givensample size(n)=30Mean(x¯)=220standard deviation(s)=77x=408

Q: Write down the formulas for the standard deviation of x.

A: The formula for the sample standard deviation can be written as: Here, n is the sample size and x̅…

Q: Suppose a friend tells you that the average length of trout caught in pyramid lake is u=19 inches.…

A: Given information Hypothesized mean = 19 Sample Standard deviation = 3.5 Sample mean = 18.6 Sample…

Q: Find the simple standard deviation of the data. Be sure to include the screenshot of excel of your…

A: Let X: Parking Ticket fines (Canadian $)   The data is given as : X 30 15 40 40 40 30…

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: Roll a pair of die 36 times, and draw a bar graph of all the outcomes. Using the data, find the…

A: In question,  Given that a pair of dice is rolled 36 times. Then we'll find mean Variance and…

Q: A photoconductor film is manufactured at a nominal thickness of 25 mils. The pr increase the mean…

A: Solution: Given information: n1=8n2=8x1=1.15x2= 1.06s1=0.11s2= 0.09α=0.10

Q: The heights of Ukranian women are normally distributed with a mean of 71 inches and a standard…

A: It is given that the heights of Ukranian women follows normal distribution with mean 71 inches and…

Q: Each year students in a local school district write a national examination. The average on this…

A: Given data Mean = 150 Standard deviation=20

Q: The average age of senators in the 108th Congress was 62 years. If the standard deviation was 12.5…

A: Solution: Let X be the age of senator. From the given information,

Q: A California lake has been stocked with rainbow trout. These trout have an average length of 24…

A: Given Information: Mean μ=24 Standard deviation σ=3 Someone goes fishing and catches a trout that is…

Q: In a population, the data value 180 has a z score of -0.8. The standard deviation of this population…

A: The question is about z score.Given :Raw value ( x ) = 180z score = -0.8Standard deviation of the…

Q: Suppose the mean length of songs played on a radio station is 190 seconds with a standard deviation…

A:

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.