The average weight of a 12 year old boy in the United States is 96 lb. In a sample of 36 twelve-year-old boys at a given doctor's office, the average weight was 87 pounds (standard deviation is 16). Is the average weight of the boys at the doctor's office significantly lower than the national average? Calculate the z or t test statistic

Q: Use the sample mean(78.5)and sample standard deviation (12.3671)in your calculations below. Use…

A: Given that:

Q: Public health statistics indicate that 26% of  American adults smoke cigarettes. A random sample of…

A:

Q: Find the 30th percentile of the blood pressures. Find the 67th percentile of the blood pressures.…

A: Consider a random variable X which represents the diastolic blood pressures of adult women in the…

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: The properties of the normal distribution is,   The Normal distribution curve is and bell shaped…

Q: Multiplying every score is a sample by a constant value will change the value of the standard…

A: Standard deviation is a measure of the amount of dispersion of a set of values. It is obtained by…

Q: The mean assessed value of homes in Southern County is $158,000 with a standard deviation of…

A: Old mean = E(X) = 158000 Old SD = SD(X) = 32000

Q: Find the sample standard deviation.

A: Given that:n= 12  Sample size

Q: sports analytics firm would like to test whether Kyrie Irving’s points per game is different from…

A: Sample size=19

Q: Calculate the mean, standard deviation, and variance for the following five scores: 9, 4, 7, 1, 4.

A: Considering the scores as population. The population mean is, μ=∑XN=9+4+7+1+45=255=5 Thus, the…

Q: At a=0.05, what is the critical value? -1.984 1.66 -1.645 -1.66

A:

Q: Calculate the mean, standard deviation, and variance for the following five scores: 9,4,7,1,4.

A:

Q: According to a magazine, people read an average of more than two books in a month. A survey of 25…

A: Suppose μ is the population average number of books read by people in a month.

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: A car salesperson offers you a car at the price of $22,895. You look up the mean sales price for…

A: We have given that the random variable X that is sales price. Here, X = 22895 Mean = 21900 and…

Q: A dataset that contains credit card balances has a population mean of $2870 and a population…

A: Given,mean(μ)=2870standard deviation(σ)=900sample size(n)=81

Q: On the past math summative exam the bottom 20% of students failed to pass the test.the mean for the…

A:

Q: A randomly selected list of everyday food items was generated. Twenty-eight Grub Savers stores were…

A:

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

A:

Q: What is the standard deviation of the following sample data:  34, 31, 33, 17, 46, 48.

A: Given data is 34, 31, 33, 17, 46, 48.We have to find the standard deviation.

Q: The circumference of head sizes of newborns is approximately normal with mean 13.5 inches and…

A: Given Population mean μ=13.5, standard deviations σ=0.75  P(X<a)=10%

Q: A standardized test has a pop. mean of 152 and a standard deviation of 16. Molly scores at the 91st…

A:

Q: 500 freshmen at Prairieville High School took an algebra test.  The scores were normally distributed…

A: According to the Bartleby guidelines experts solve only one question and maximum three subparts…

Q: what is the mean and standard deviation of the following sample:  8, 1, 5, 1, 5

A: From the given information, X= {8, 1, 5, 1, 5}Mean and standard deviation of the sample can be…

Q: Five cars of the same year and model were tested for gas mileage in highway driving and the results…

A: The data are X: 30,39,33,31,27

Q: On a nationwide math test, the mean was 72 and the standard deviation was 7. If Roberto scored 90,…

A: Given that, Mean = 72 Standard deviation = 7

Q: The salary for workers at a company are normally distributed with a mean of $60,000 and a standard…

A:

Q: A commuter travels many miles to work each morning. She has timed this trip 5 times during the last…

A:

Q: The mean or average number of days for someone age 12 and older in the US to smoke weed (if they…

A: According to the given information in this question We need to find number of days per year smoke…

Q: A sandwich shop claims to sell sub sandwiches that are 12 inches lona. An employee is a little…

A: We have given information, μ=12 inches n=45 x¯=12 inches s= 18 inches

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: Given information- Population mean, µ = $45,000 Population standard deviation, σ = $6,200 Sample…

Q: The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances…

A:

Q: eights were measured from 35 college students in September and April of th ar.What statistical test…

A: Weights is the continuous quantity and if the population follow normal distribution then the two…

Q: Six different​ second-year medical students at Bellevue Hospital measured the blood pressure of the…

A: Given 126,138,132,138,124,122

Q: Consider the following data: 10,6,1,2,8,9 Calculate the value of the sample standard deviation.…

A:

Q: The mean annual wage per employee for each state and the District of Columbia for the year 2009 is…

A: The mean annual wage per employee for each state and the District of Columbia for the year 2009 is,…

Q: A group of customer service surveys were sent out at random. The scores were 40, 70, 80, 00, 50, 40,…

A:

Q: Suppose you made 5 measures of your walking stride and got the following values: 0.81 m,  0.87 m,…

A: 0.81,0.87,0.79,0.84,0.83

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: It is given that the mean is 47,000 and standard deviation is 4,600.

Q: According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the…

A: Given X is normal Distributed with mean µ = 65.0 and standard deviation σ = 3.0 Need to find Z score…