# data[].attributes.body
qn 56
qn 56
t test
an entrepreneur is considering..
an entrepreneur is considering..
z test

# data[].attributes.body
t test

# data[].attributes.body
z test

# data[].attributes.body
z test

# data[].attributes.body
One sample Z test because the sample > 30
56. A manager of the
56.	A manager of the credit department for an oil company would like to determine whether the average monthly balance of credit card holders is equal to $75. An auditor selects a random sample of 100 accounts and finds that the average owed is $83.40 with a sample standard deviation of $23.65. If you wanted to test whether the auditor should conclude that there is evidence that the average balance is different from $75, which test would you use?
The owner of a local
The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. The appropriate hypotheses to test are:
The owner of a local
The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30 with a standard deviation of 5 years. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 30.45 years and the sample . What is the p value associated with the test statistic?
The owner of a local
The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. The appropriate hypotheses to test are:
z test
z test

# data[].attributes.headline
 Credit department: One sample Z test because the sample > 30

# data[].attributes.subject
 Credit department: One sample Z test because the sample > 30

# data[].attributes.body
56. A manager of the credit department for an oil company would like to determine whether the average monthly balance of credit card holders is equal to $75. An auditor selects a random sample of 100 accounts and finds that the average owed is $83.40 with a sample standard deviation of $23.65. If you wanted to test whether the auditor should conclude that there is evidence that the average balance is different from $75, which test would you use?

# data[].attributes.body
The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. The appropriate hypotheses to test are:

# data[].attributes.body
The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30 with a standard deviation of 5 years. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 30.45 years and the sample . What is the p value associated with the test statistic?

# data[].attributes.body
The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. The appropriate hypotheses to test are:

# data[].attributes.body
Null Hypothesis (H0): Local Nightclub has customers of an average age of 30 (mu = 30)

Alternative Hypothesis (H1): Local Nightclub has customers of an average age of more than 30 (mu > 30)

# data[].attributes.body
z test

# data[].attributes.body
qn 56

# data[].attributes.body
Sample Mean: 30.45
Standard Deviation: 5 years
Sample of n: 250 customers

Z = X-bar - Mean / (Standard Deviation / Square root n)
= (30.45 - 30) / (5 / Square root 250)
= 1.423024947
= 1.42(3d.p)

Z-score = 0.4222
P-value = 0.5 - 0.4222
= 0.0778
= 0.078 (3.dp)

# data[].attributes.body
A manager of the credit department for an oil company would like to determine whether the average monthly balance of credit card holders is equal to $75. An auditor selects a random sample of 100 accounts and finds that the average owed is $83.40 with a sample standard deviation of $23.65. If you wanted to test whether the auditor should conclude that there is evidence that the average balance is different from $75, which test would you use?

# data[].attributes.body
An entrepreneur is considering the purchase of a coin-operated laundry. The present owner claims that over the past 5 years, the average daily revenue was $675 with a standard deviation of $75. A sample of 30 days reveals a daily average revenue of $625. If you were to test the null hypothesis that the daily average revenue was $675, which test would you use?