A pitcher out of University of Texas is trying out for MLB scouts before the draft. People claim that he throws 100 mph fastballs. During the tryout, he threw 40 pithces  with an average speed of 98.2 mph with a standard deviation of 2.5 mph. Create a 99% confidence interval for the sample. Would the claim that the pitcher throws 100 mph stand based on this tryout?

Q: A consumer organization tested two paper shredders, the Piranha and the Crocodile, designed for home…

A: Given, For  Piranha: n1= 10 x̄1  = 203 s1 = 6 For Crocodile: n2= 10 x̄2  = 187 s1 = 5

Q: In a sample of 31 students, the mean scholarship amount received was $802, with a standard deviation…

A: Given Information: Sample size n = 31 Sample mean = $802 Standard deviation = $22.47 Confidence…

Q: een asked by Forest Hill Elementary School to evaluate the school's drinking water. The lab tested…

A: We have, x¯=sample mean=8.43s=sample standard deviation=1.12n=sample size=24Confidence…

Q: In a random sample of 40 visitors to a certain theme park, it was determined that the mean amount of…

A:

Q: From a random sample of 64 high school seniors, the sample mean and standard deviation of the math…

A: Given,sample size(n)=64sample mean(x)=90standard deviation(s)=7degrees of…

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 421,…

A:

Q: If a school district takes a random sample of 63 Math SAT scores and finds that the average is 488,…

A: Given information Sample size (n) = 63 Sample mean x̅ = 488 Population standard deviation σ = 100…

Q: n a random sample of 24 hip surgeries of a certain type, the mean surgery time was 136.9 minutes…

A: Given: X¯=136.9s=22.6n=24

Q: In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean…

A:

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift results…

A:

Q: The National Association of Colleges (NAC) reported in 2003 that the mean starting salary for…

A:

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A:

Q: A random sample of 40 home theater systems has a mean price of $500 and a standard deviation of $60.…

A: Construct the 99% confidence interval for the population mean The 99% confidence interval for the…

Q: Fifteen Smart Cars were randomly selected and the highway mileage of each was noted. The analysis…

A:

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A: It is given that the mean is 433 and the population standard deviation is 100.

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 497,…

A:

Q: In a recent study of 42 eighth graders, the mean number of hours per week that they watched…

A: Mean = 19.6 Standard deviation = 5.8 Sample size n = 42

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 497,…

A: From the provided information, Sample size (n) = 89 Sample mean (x̅) = 497 Population standard…

Q: In a simple random sample of 30 shoppers at Greedgate Mall, the sample mean amount spent last week…

A: The provided information are: Sample size (n) = 30Sample meanx¯=259.48Sample standard…

Q: In a simple random sample of 30 shoppers at Geedgate Mall, the sample mean amount bspent last week…

A: The provided information are: Sample sizen=30Sample meanx¯=259.48Sample standard deviations=39.18.

Q: A commonly cited standard for one-way length (duration) of school bus rides for elementary school…

A: Given: x=38s=8μ0=30

Q: The administrator at a local hospital states that on weekends the average wait time for…

A: H0 : the average ER wait time is 10 minutes H1 : the average ER wait time exceeds 10 minutes

Q: A large department store found that it averages 362 customers per hour. Assume that the standard…

A:

Q: A printer cartridge company claims their ink lasts for more than 5,000 words. The number of words…

A: Given: n= 50.0 , x̄= 4940.0 σ= 20.0 At 98.0 % confidence level , z score= 2.326

Q: Based on a random sample of 1,020 adults, the mean amount of sleep per night is 8.09 hours. Assuming…

A:

Q: A commonly cited standard for one-way length (duration) of school bus rides for elementary school…

A: The given information is the time duration of school bus rides for elementary school children in…

Q: Recent business graduates currently employed in full-time positions were surveyed. Family…

A: Confidence interval for the difference between the two population means. For two small sample sizes…

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 494,…

A:

Q: If a school district takes a random sample of 71 Math SAT scores and finds that the average is 460,…

A: Given : n = 71 Mean = 460 Standard deviation = 100 Confidence level = 99%

Q: A simple random sample of 35 cars and trucks in Vermont have a mean price of $18,702 with a standard…

A: In this question, we have given information35 cars and trucks in Vermont have mean $18702 and…

Q: The average weight of 50 randomly selected minivans was 4,200 pounds. The minivan population…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: In a sample of 32 students, the mean scholarship amount received was $887, with a standard deviation…

A: Given information: n=32x¯=887s=27.4 df=n-1=32-1=31 Confidence level is 90% Significance level is…

Q: bank wonders whether omitting the annual credit card fee for customers who charge at least $2500 in…

A: Here,   sample size : n = 200  sample mean : x¯ = $346  standard deviation: s = $112∴Standard error…

Q: Researchers have estimated that office workers in Belgium receive an average of 15 e-mails per day.…

A: It is given that, The sample mean is 15. The sample standard deviation, s is 3.5. The sample size, n…

Q: The head of the quality department of a battery factory needs to estimate the average lifetime of a…

A: Here we have been provided with population standard deviation , σ = 100 hours sample size , n = 64…

Q: According to the Vivino website, the mean price for a bottle of red wine that scores 4.0 or higher…

A: We have given that  Sample size n=56 , standard deviation s=12 ,sample mean xbar=30.15

Q: survey, 30 people were asked how much they spent on their child's last birthday gift. The results…

A: From the available information, Sample size, n=30 Sample mean,  Sample standard deviation, s=$19.…

Q: 3. Another engineer studies the strength of cables, which has a known population standard deviation…

A: Here we need to obtain the minimum sample size required to obtain a 97% confidence interval.

Q: A consumer organization tested two paper shredders, the Piranha and the Crocodile, designed for home…

A:

Q: For a simple random sample of 40 Honda Accords (4 cylinder, 2.4 liter, 5-speedautomatic), the mean…

A: Sample size , n = 40 Mean gas mileage, Standard deviation,

Q: .A sample of seven college wrestlers had an average weight of 267 pounds with a sample standard…

A: It is given that sample mean is 267 and the sample standard deviation is 10.

Q: On the Stanford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with a…

A: Given  population mean μ=100, n=sample size=21, sample mean x̄=92, sample standard deviations s=6.92…

Q: The average weight of 31 randomly selected minivans was 4150 pounds. The sample standard deviation…

A: Given that, Mean = 4150 Standard deviation = 480 Sample size = 31 99% confidence level

Q: Suppose Apple claims that the average wait time for a customer calling the Apple Care support line…

A:

Q: There is no prior information about the proportion of Americans who support free trade in 2018. If…

A:

Q: Do younger people use Twitter more often than older people? In a random sample of 316 adult Internet…

A:

Q: A real estate company is trying to estimate the cost of rent in Houston. They randomly sample 10…

A:

Q: Wildlife conservationists studying grizzly bears in the United States found that the mean weight of…

A:

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 442,…

A: Given that, Sample size n=80 Sample average x¯=442 Population standard deviation σ=100

Q: In a sample of 45 students, the mean scholarship amount received was $854, 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.