A random sample of 144 checking accounts at a bank showed an average daily balance of...
A random sample of 144 checking accounts at a bank showed an average daily balance of $295. The standard deviation of the population is known to be $72. Please answer the following questions:
|
(a) |
Find the standard error of the mean. |
|
(b) |
Give a point estimate of the population mean. |
|
(c) |
Construct a 95% confidence interval estimates for the mean. |
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A random sample of 144 checking accounts at a bank showed an
average daily balance of...
a-c please 2. A random sample of 144 checking accounts at a bank showed an average...
a-c please
2. A random sample of 144 checking accounts at a bank showed an average daily balance of $295. The standard deviation of the population is known to be $72. Please answer the following questions: (a) Find the standard error of the mean. (b) Give a point estimate of the population mean. (c) Construct a 95% confidence interval estimates for the mean.
A sample of 64 account balances from a credit company showed an average daily balance of...
A sample of 64 account balances from a credit company showed an average daily balance of $1,040. The standard deviation of the population is known to be $200. We are interested in determining if the mean of all account balances (i.e., population mean) is significantly different from $1,000.Using the critical value approach at 95% confidence, test the hypotheses.
A sample of 64 account balances from a credit company showed an average daily balance of...
A sample of 64 account balances from a credit company showed an average daily balance of $1,045. The standard deviation of the population is known to be $240. We are interested in determining if the mean of all account balances (i.e., population mean) is significantly different from $1,000. Question: Using the p-value approach at 95% confidence, test the above hypotheses.
Patty, a branch manager of a bank, would like a quick estimate of the mean checking account balance of all checking account customers. A random sample of checking 32 account balances results in a sample mean of $312,590.50 and a standard deviation of $52,
Patty, a branch manager of a bank, would like a quick estimate of the mean checking account balance of all checking account customers. A random sample of checking 32 account balances results in a sample mean of $312,590.50 and a standard deviation of $52,100. Calculate and interpret a 95% confidence interval for the mean checking account balance. Round off all answers to two decimal places with complete solutions.
2. A sample of 64 account balances from a credit company showed an average daily balance...
2. A sample of 64 account balances from a credit company showed an average daily balance of $1,050. The standard deviation of the population is known to be $240. We are interested in determining if the mean of all account balances (i.e., population mean) is significantly different from $1,000. Question: Using the p-value approach at 95% confidence, test the above hypotheses. [Hint: This is a Two-tailed Hypothesis Testing. If it can be typed I would highly appreciate it so I...
the average selling price of a smartphone purchased by a random sample of 46 customers was...
the average selling price of a smartphone purchased by a random sample of 46 customers was $317. Assume the population standard deviation was $32. a) Construct a 95% confidence interval to estimate the average selling price in the population with this sample. b) What is the margin of error for this interval?
-0.07 0.07 z 2. A bank has kept records of the checking balances of its customers...
-0.07 0.07 z 2. A bank has kept records of the checking balances of its customers and determined that the average daily balance of its customers is $300 with a standard deviation of $48, and is a normally distributed population. A random sample of 144 checking accounts is selected a) What is the probability that the sample mean will be at least $306.60? b) What is the probability that the sample mean will be less than $308? c) What is...
The average selling price of a smartphone purchased by a random sample of 43 customers was...
The average selling price of a smartphone purchased by a random sample of 43 customers was $315. Assume the population standard deviation was $34. a. Construct a 95% confidence interval to estimate the average selling price in the population with this sample. b. What is the margin of error for this interval? a. The 95% confidence interval has a lower limit of and an upper limit of. (Round to the nearest cent as needed.) b. The margin of error is....
1. A random sample of 82 customers, who visited a department store, spent an average of...
1. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation of expenditures at this store is O = $19. What is the e 98% confidence interval for the population mean? 2. A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32 Assuming that the population has a normal distribution, what is the 90% confidence interval for the population mean? 3....
A pediatrician's records showed the mean height of a random sample of 25 girls at age...
A pediatrician's records showed the mean height of a random sample of 25 girls at age 12 months to be 29.530 inches with a standard deviation of 1.0953 inches. Construct a 95% confidence interval for the population variance. (Round your answers to 4 decimal places.) The 95% confidence interval is from____ to ____
a-c please
2. A random sample of 144 checking accounts at a bank showed an average daily balance of $295. The standard deviation of the population is known to be $72. Please answer the following questions: (a) Find the standard error of the mean. (b) Give a point estimate of the population mean. (c) Construct a 95% confidence interval estimates for the mean.
-0.07 0.07 z 2. A bank has kept records of the checking balances of its customers and determined that the average daily balance of its customers is $300 with a standard deviation of $48, and is a normally distributed population. A random sample of 144 checking accounts is selected a) What is the probability that the sample mean will be at least $306.60? b) What is the probability that the sample mean will be less than $308? c) What is...
1. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation of expenditures at this store is O = $19. What is the e 98% confidence interval for the population mean? 2. A sample of 25 elements produced a mean of 123.4 and a standard deviation of 18.32 Assuming that the population has a normal distribution, what is the 90% confidence interval for the population mean? 3....
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