Question

Dot miller owns a small chain of dive shops. she is interested in knowing how many potential customers she will need to sample in several large cities within a three- to four-hour drive of her shops located on the california coast. she wants to estimate the mean response to a 10-point scale measuring the likelihood that they will subscribe to a dive package which, if they take advantage of all the dives, represents a savings of 50 percent over taking the dives individually. in estimating the standard deviation in the population for the formula for calculating the sample size for estimating a mean, dot can: rely on the knowledge of other owners in the dive industry to share their knowledge of surveying scuba divers. use some prior knowledge about the population, undertake a pilot study or estimate the range, and divide by 10. use some prior knowledge about the population, undertake a pilot study or estimate the range (7), and divide by 6. undertake a pilot study using members of the dive population who live near the present dive shops. none of these; if you do not have the actual standard deviation, you cannot use the formula.

Answer 1

Standard deviation is an amount of the dispersion of a group of data from its mean. It is computed as the square root of variance by distinguishing the variation amid each data point relative to the mean. If the data points are distant from the mean, there is greater deviation within the data set. But since not all are given in this problem Dot can use some previous knowledge about the population, undertake a pilot study or approximation the range (7), and divide by 6.