Problem 7CRE

Histogram of Grooming Times Use the frequency distribution from Exercise to construct a histogram. Based on the result, do the data appear to be from a population with a normal distribution? Explain.

Exercise

Grooming Time Listed below are times (minutes) spent on hygiene and grooming in the morning (by randomly selected subjects) (based on data from a Svenska Cellulosa Aktiebolaget survey). Construct a table representing the frequency distribution. Use the classes 0–9, 10–19, and so on.

Answer:

Step 1 of 1

C - I |
Frequency |

0-9 |
2 |

10-19 |
3 |

20-29 |
9 |

30-39 |
4 |

40-49 |
2 |

From the graph, we observe that the frequency is symmetric and bell-shaped. Hence the data appear to be from a population with a normal distribution.