Question

Most dermatologists recommend using sunscreens that have a sun protection factor (SPF) of at least 30. One professor wanted to find out whether the SPF of sunscreens used by students at the professor's school (which is in a very sunny part of the United States) exceeds this value, on average. To collect data, the professor surveyed students in an Introductory Statistics course and found that in a sample of 48 students, the mean SPF was 35.29 Select the graph type(s) that could be used to visualize the variable SPF of sunscreen used. Select all that apply Dotplot Histogram Bar graph

Answer 1

To visualize the variable SPF of sunscreen used by the students, the following graph types could be used:

1. Dotplot: This can be used to show individual data points for each student's SPF value, allowing for a clear representation of the distribution of SPF values.

2. Histogram: This can be used to display the frequency distribution of the SPF values, providing insights into how many students used sunscreens within certain SPF ranges.

Bar graph is not suitable for this continuous variable (SPF), as it is typically used for categorical data.

So, the appropriate choices are Dotplot and Histogram.