Chapter 3, Section 1, Exercise 023

Topical Painkiller Ointment

The use of topical painkiller ointment or gel rather than pills for pain relief was approved just within the last few years in the US for prescription use only.¹Insurance records show that the average copayment for a month's supply of topical painkiller ointment for regular users is. A sample ofregular users found a sample mean copayment of.

(a) Identify each ofandas a parameter or a statistic.

is a

population parameter or sample statistic

.

is apopulation parameter or sample statistic

.

SHOW HINT

(b) Give the appropriate notation for.30

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(c) Give the appropriate notation for27.90

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(d) If we takesamples of sizefrom the population of all copayments for a month's supply of topical painkiller ointment for regular users and plot the sample means on a dotplot, describe the shape you would expect to see in the plot and where it would be centered.

The shape of the plot will besymmetric and bell-shapedskewed to the rightskewed to the left

and the center will be at3027.9075

.

SHOW HINT

(e) How many dots will be on the dotplot you described in part (d)?

Enter the exact answer.

dots

exact number, no tolerance