According to an avid aquarist, the average number of fish in a 20-gallon tank is 10,...

According to an avid aquarist, the average number of fish in a 20-gallon tank is 10, with a standard deviation of two. His friend, also an aquarist, does not believe that the standard deviation is two. She counts the number of fish in 15 other 20-gallon tanks. Based on the results that follow, do you think that the standard deviation is different from two? Data: 11; 10; 9; 10; 10; 11; 11; 10; 12; 9; 7; 9; 11; 10; 11

a. what is the degree of freedom?

b. what is the test statistic?

c. what is the p-value?

d. accept or reject

Solutions

Expert Solution

we have given that According to an avid aquarist, the average number of fish in a 20-gallon tank is 10, with a standard deviation of two.

We want to test that for 15 sample size of 20-gallon fish tank standard deviation is different from 2.

Let X:- number of fish in 20-gallon tanks

orchestra answered 1 year ago

Next > < Previous

Related Solutions

11.) According to an avid aquarist, the average number of fish in a 20-gallon tank is...

11.) According to an avid aquarist, the average number of fish in a 20-gallon tank is 10, with a standard deviation of two. His friend, also an aquarist, does not believe that the standard deviation is two. She counts the number of fish in 15 other 20-gallon tanks. Based on the results that follow, do you think that the standard deviation is different from two? Data: 11; 10; 9; 10; 10; 11; 11; 10; 12; 9; 7; 9; 11; 10;...

If an average veichle has a 14 gallon tank and octane used as fuel undergoes complete...

If an average veichle has a 14 gallon tank and octane used as fuel undergoes complete combustion(Only Co2 and H20 are products) how many liters of Co2 will be emitted in the air at one atm and 300K

A 200 gallon tank initial contains 100 gallons of water and 20 pounds of dissolved salt....

A 200 gallon tank initial contains 100 gallons of water and 20 pounds of dissolved salt. Brine solution begins to enter the tank at the rate of 2 gal/min with a salt concentration of 2 lb/gal. The well mixed solution leaves the tank at the rate of 1 gal/min. Find the amount of salt inside the tank 50 minutes after the process starts?

A) A 50 gallon tank initially contains 10 gallons of fresh water. At t = 0...

A) A 50 gallon tank initially contains 10 gallons of fresh water. At t = 0 t = 0 a brine solution containing 1 pound of salt per gallon is poured into the tank at the rate of 4 gal/min., while the well-stirred mixture leaves the tank at the rate of 1 gal/min. Find the amount of salt in the tank at the moment of overflow. B) A tank contains 100100 g of salt and 400400 L of water. Water...

According to American Automobile Association, the average cost of a gallon of regular unleaded fuel at...

According to American Automobile Association, the average cost of a gallon of regular unleaded fuel at gas stations in May 2014 was $3.65. Assume that the standard deviation of such cost is $0.25. Suppose that a random sample of n=100 gas stations is selected from the population and the cost per gallon of regular unleaded fuel is determined for each. What is the approximate probability that the sample has a mean fuel cost between $3.60 and $3.70? Group of answer...

A 100 gallon tank initially contains 10 gallons of fresh water. At t=0 a brine solution...

A 100 gallon tank initially contains 10 gallons of fresh water. At t=0 a brine solution containing 1 pound of salt per gallon is poured into the tank at the rate of 4 gal/min., while the well-stirred mixture leaves the tank at the rate of 2 gal/min. Find the amount of salt in the tank at the moment of overflow. Enter answer as numerical decimal correct to two decimal places. pounds.

10 A survey of 25 grocery stores revealed that the average price of a gallon of...

10 A survey of 25 grocery stores revealed that the average price of a gallon of milk was $2.98, with a standard error of $0.10. What is the 98% confidence interval to estimate the true cost of a gallon of milk? Multiple Choice $2.85 to $3.11 $2.73 to $3.23 $2.95 to $3.01 $2.94 to $3.02 11. A sample of 100 is selected from a known population of 350 elements. The population standard deviation is 15. Using the finite correction factor,...

The average number of miles driven on a full tank of gas in a certain model...

The average number of miles driven on a full tank of gas in a certain model car before its low-fuel light comes on is 341. Assume this mileage follows the normal distribution with a standard deviation of 39 miles. Must show ALL calculations by use of formulas ONLY, no Excel use. Complete parts a through d below. a. What is the probability that, before the low-fuel light comes on, the car will travel less than 369 miles on the next...

Suppose that you are interested in estimating the average number of miles per gallon of gasoline...

Suppose that you are interested in estimating the average number of miles per gallon of gasoline your car can get. You calculate the miles per gallon for each of the next twenty-five times you fill the tank. Suppose that in truth, the values for your car are bell-shaped, with a mean of 20 miles per gallon and a standard deviation of 1. Find the possible sample means you are likely to get based on your sample of twenty-five observations. Consider...

An 800-gallon, 1.2 m wide cylindrical water tank is filled to the brim. The tank has...

An 800-gallon, 1.2 m wide cylindrical water tank is filled to the brim. The tank has a hole formed at 13.3 cm above the ground. It is observed that water leaks out of the reservoir at a speed that reduces by 3.2 m.s-1 in 1 minute 39 seconds. If the tank was initially filled to the brim how much water leaked out of the tank, and 8.2 by how much shall the point, at which water lands, change? (1 gallon...

Subjects