In 1940 the average size of a U.S. farm was 174 acres. Let's say that the...
In 1940 the average size of a U.S. farm was 174 acres. Let's say that the standard deviation was 56 acres. Suppose we randomly survey 42 farmers from 1940 O Part (a) O Part (b) B Part (c) Give the E Part (d) The mode 50% of the distributin for the bonds of which form the distance represented by the i lies between what two values? Round your answers to two deo al places acres (smaller value) acres (larger value)
1. X ~ N(50, 12). Suppose that you form random samples of 25 from this distribution. Let X be the random variable of averages. Let ΣX be the random variable of sums.Sketch the graph, shade the region, label and scale the horizontal axis for X, and find the probability. (Round your answer to four decimal places.) P(8 < X < 47) = 2.Some statistics students estimated that the amount of change daytime statistics students carry is exponentially distributed with a...
The mean age of De Anza College students in a previous term was 26.6 years old. An instructor thinks the mean age for online students is older than 26.6. She randomly surveys 56 online students and finds that the sample mean the 5% level s 29.8 with a standard deviation of 2.1. Conduct a hypothesis test Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you...
13% O 10:55 Grade: 1.6/10 Print Version On average, indoor cats live to 13 years old with a standard deviation of 2.4 years. Suppose that the distribution is normal. Let X the age at death of a randomly selected indoor cat. Round answers to 4 decimal places where possible. what is the distribution of X? X N a. b. Find the probability that an indoor cat dies when it is between 15 and 16.7 years old. c. The middle 20...
How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F. A random sample of prices ($) for sleeping bags in this temperature range is given below. Assume that the population of x values has an approximately normal distribution. 105 100 50 110 85 70 30 23 100 110 105 95 105 60 110 120 95 90 60 70 (a) Use a calculator with mean and...
The average student loan debt for college graduates is $25,500. Suppose that that distribution is normal and that the standard deviation is $12,000. Let X = the student loan debt of a randomly selected college graduate. Round all probabilities to 4 decimal places and all dollar answers to the nearest dollar. The middle 20% of college graduates' loan debt lies between what two numbers? Low: $ High: $
Part # 1 How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F. A random sample of prices ($) for sleeping bags in this temperature range is given below. Assume that the population of x values has an approximately normal distribution. 80 115 110 55 40 70 30 23 100 110 105 95 105 60 110 120 95 90 60 70 (a) Use a calculator...
How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F. A random sample of prices ($) for sleeping bags in this temperature range is given below. Assume that the population of x values has an approximately normal distribution. 40 85 90 85 90 50 30 23 100 110 105 95 105 60 110 120 95 90 60 70 (a) Use a calculator with mean and...
On average, indoor cats live to 12 years old with a standard deviation of 2.7 years. Suppose that the distribution is normal. Let X = the age at death of a randomly selected indoor cat. Round answers to 4 decimal places where possible. a. What is the distribution of X? X ~ N(,) b. Find the probability that an indoor cat dies when it is between 7.5 and 10.4 years old. c. The middle 20% of indoor cats' age of...
On average, indoor cats live to 15 years old with a standard deviation of 2.3 years. Suppose that the distribution is normal. Let X = the age at death of a randomly selected indoor cat. Round answers to 4 decimal places where possible. a. What is the distribution of X? X ~ N(,) b. Find the probability that an indoor cat dies when it is between 15.6 and 18.8 years old. c. The middle 30% of indoor cats' age of...