Ten years ago, a random sample of 257 dog owners was taken and it was found...

Ten years ago, a random sample of 257 dog owners was taken and it was found that 146 owned more than one dog. Recently, a random sample of 380 dog owners showed that 200 owned more than one dog. Do these data indicate that the proportion of dog owners owning more than one dog has decreased? Use a 5% level of significance.

State the null and alternate hypotheses. Is the test left-tailed, right-tailed, or two- tailed?
Identify the appropriate sampling distribution: the standard normal or the Student’s t. What is the value of the sample test statistic?
Find or estimate the P-value.
Based on your answers for parts (a) through (c), will you reject or fail to reject the null hypothesis?

Solutions

Expert Solution

Page 1

Page 2

Page 3

orchestra answered 1 year ago

Next > < Previous

Related Solutions

In a random sample of 40 dog owners enrolled in obedience training, it was determined that...

In a random sample of 40 dog owners enrolled in obedience training, it was determined that the mean amount of money spent per owner was $107.89 per class with a standard deviation of $8.20. Construct and interpret a 95% confidence interval for the mean amount spent per owner for an obedience class.

In a random sample of 1008 U.S. adults taken 10 years ago, 515 think that the...

In a random sample of 1008 U.S. adults taken 10 years ago, 515 think that the U.S. government is doing too little to protect the environment. In a recent random sample of 1022 U.S. adults, 480 think that the U.S. government is doing too little to protect the environment. At ? = 0.05, test the claim that the proportion of U.S. adults who think that the U.S. government is doing too little to protect the environment has changed? Create a...

1. In a random sample of 1008 U.S. adults taken 10 years ago, 515 think that...

1. In a random sample of 1008 U.S. adults taken 10 years ago, 515 think that the U.S. government is doing too little to protect the environment. In a recent random sample of 1022 U.S. adults, 480 think that the U.S. government is doing too little to protect the environment. At ? = 0.05, test the claim that the proportion of U.S. adults who think that the U.S. government is doing too little to protect the environment has changed? Show...

For a random sample of 256 owners of medium-sized cars, it was found that their average...

For a random sample of 256 owners of medium-sized cars, it was found that their average monthly car insurance premium for comprehensive cover was R356. Assume that the population standard deviation is R44 per month and that insurance premiums are normally distributed. Find the 95% confidence interval for the average monthly comprehensive car insurance premium paid by all owners of medium-sized cars. Interpret the results. [9 Marks] Find the 90% confidence interval for the same problem. Interpret...

A random sample of 378 hotel guests was taken at La Mirage and it was found...

A random sample of 378 hotel guests was taken at La Mirage and it was found that 194 requested non-smoking room. Another random sample of 516 hotel guests at Neptune Grand showed that 320 requested non-smoking room. We wan to test the claim that the percentage of guests requesting non-smoking room is different between the two hotels, using significance level 0.05. Round you answer to 3 decimal places.

A survey taken several years ago found that the average time a person spent reading the...

A survey taken several years ago found that the average time a person spent reading the local newspaper was 10.8 minutes. The standard deviation of the population was 3 minutes. To see whether the average time had changed since the newspaper’s format had changed, the editor surveyed 36 individuals. The average time that these 36 people spent reading the newspaper was 11.2 minutes. At  = 0.05 , is the average time an individual spends reading the newspaper still 10.8?...

The Nellie Mae organization found that in a random sample of 100 undergraduate students taken in...

The Nellie Mae organization found that in a random sample of 100 undergraduate students taken in 2004, the average credit card balance was $2169. Suppose sample standard deviation of these credit card balances is $1000. Perform a test to test if the average credit card debt exceeds $2000. a) Identify the population Identify the variable: Identify the parameter b) Calculate T stat Find P-value with DF

In a random sample of 257 adult Orcas in the wild, there were 159 whose total...

In a random sample of 257 adult Orcas in the wild, there were 159 whose total body length was 28 feet or longer. Create a 98% confidence interval for the population proportion of adult Orcas in the wild who total body length is 28 feet or longer. Enter the lower and upper bounds for the interval in the following boxes, respectively. You may answer using decimals rounded to four places or a percentage rounded to two. Make sure to use...

One hundred students were given an Algebra test. A random sample of ten students was taken...

One hundred students were given an Algebra test. A random sample of ten students was taken out of class of 800 enrolled students. The time it took each student to complete the test is recorded below. 22.2, 23.7, 16.8, 18.3, 19.7, 16.9, 17.2, 18.5, 21.0, and 19.7 a. Find the mean, variance and standard deviation for this sample of ten students b. Construct a 95% confidence interval for the population mean time to complete this Algebra test. c. Test if...

A random sample of 80 car owners were asked how many years they had owned their...

A random sample of 80 car owners were asked how many years they had owned their current car. The results were ¯x=7x¯=7 years and s=2s=2. Estimate how long ago people typically acquired their car (at the 90% confidence level). Here, we should use: 2-SampTInt ZInterval 1-PropZInt 2-SampZInt 2-PropZInt TInterval

Subjects