A researcher wants to know if there is a clear leader among the five most popular manufacturers of laptop computers, or whether they are all about equally popular. He asks a random sample of 250 people which brand of computer they trust most. Here are the results: Toshiba Most-trusted brand Apple Frequency Lenovo 66 45 Asus 43 Dell 42 54 Which of the following represents the component of the chi-square statistic for Toshiba? (54-50) 54 O 54- 50 54 * (54- 50) 54 (54-50) 50 O (54-50) 50

An article reported that in a particular year, there were 717 bicyclists killed on public roadways in a particular country, and that the average age of the cyclists killed was 43 years. These figures were based on an analysis of the records of all traffic-related deaths of bicyclists on public roadways of that country. (a) Does the group of 717 bicycle fatalities represent a census or a sample of the bicycle fatalities for that year? O a census O a sample (b) If the population of interest is bicycle traffic fatalities for this particular year, is the given average age of 43 years a number that describes a sample or a number that describes the population? O a number that describes a sample O a number that describes the population

A 2012 study of freely forming groups in bars all over Europe examined the natural behavior of groups. The researchers recorded the group size (number of individuals in the group) of all 501 groups in the study that were naturally laughing. The findings were displayed in the figure below. 300 Number of groups 250 200 O 52 O 2.7 0 2 150 3.5 4 100 50 0 254 2 Enter your answer here The median laughter group size in this study is 168 3 The mean laughter group size in this study is O 100.2 Enter your answer here 52 4 5 Laughter group size 21 6 6 Can we conclude from these findings that, in European bars in 2012, smaller groups were more likely than larger groups to be naturally laughing? Explain your statistical reasoning in one sentence.

The following are the ratings of males by females in an experiment involving speed dating. Use the given data to construct a boxplot and identify the​ 5-number summary.   2.02.03.04.05.05.06.06.06.06.06.07.08.08.08.08.08.58.58.58.5