Question 15 pts

A survey of 144 DVC students found the mean cost of their textbooks was $294.56, with sample standard deviation $28.50.

To find a 95% confidence interval for the mean cost of textbooks for all DVC students,

What calculator command should you use?

[ Select ]

a. ["1-PropZInt OR Proportion Stats One Sample With Summary Confidence interval for p",

b. "1-PropZTest OR Proportion Stats One Sample With Summary Hypothesis test for p",

c. "T-Test OR T Stats One Sample With Summary Hypothesis test for ",

d. "TInterval OR T Stats One Sample - Confidence interval for "]

Why is is appropriate to use this calculator command?

[ Select ]

a. ["The population distribution of the cost of textbooks is normal.",

b. "The sample mean is more than $10.00.",

c. "The sample standard deviation is more than $10.00.",

d. "The sample size is large (n >= 30)."]

Which is the correct interpretation?

[ Select ]

a. ["We are 95% confident that the sample of DVC students spent between x and y on textbooks.",

b. "95% of the amounts spent on textbooks at DVC are between x and y.

c. ", "We are 95% confident that the mean cost of textbooks for DVC students is between x and y.",

d. "95% of DVC students spend between x and y on textbooks."]

The interval you found on your calculator is between

[ Select ]

a. ["$289.87",

b. "$266.06",

c. "$274.18"] and

[ Select ]

a. ["$299.25",

b. "$321.78",

c. "$378.50"]