# Question

Treat the data obtained in the Sullivan Statistics Survey as a simple random sample of adult Americans. One question asked in the survey was “If you own a cell phone, what was your cell phone bill last month? Express answers to the penny.” Retrieve the results of this question.

(a) Draw a histogram of the data and comment on the shape.

(b) Draw a boxplot of the data.Are there any outliers?

(c) Based on the results to parts (a) and (b),explain why a large sample size might be desirable to construct a conﬁdence interval for the mean monthly cell phone bill.

(d) Use statistical software to determine the point estimate of the mean monthly cell phone bill.

(e) Use statistical software to construct a 95% conﬁdence interval for the mean monthly cell phone bill.

(a) Draw a histogram of the data and comment on the shape.

(b) Draw a boxplot of the data.Are there any outliers?

(c) Based on the results to parts (a) and (b),explain why a large sample size might be desirable to construct a conﬁdence interval for the mean monthly cell phone bill.

(d) Use statistical software to determine the point estimate of the mean monthly cell phone bill.

(e) Use statistical software to construct a 95% conﬁdence interval for the mean monthly cell phone bill.

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