AP STATS UNIT 8 PROGRESS CHECK:
MCQ PART B ACCURATE 100%
"Snoqualmie" is a name shared by a waterfall and a tribe of Native Americans. In a
study of the cultural importance of the waterfall, two groups of the Snoqualmie tribe
were randomly surveyed. One group consisted of Snoqualmie members living less than
25 miles from the waterfall. Another group consisted of Snoqualmie members living
more than 25 miles from the waterfall. The researchers asked each member to rate the
cultural importance of the waterfall as low, medium, or high. Data from the study are
presented in the following table. If the distributions of ratings are the same for those
Snoqualmie members living less than 25 miles from the waterfall and those living more
than 25 miles from the waterfall, which of the following is equal to the expected count of
members living less than 25 miles from the waterfall who rated the cultural importance
as high? - ANSWERE. ((17)(50)/88)
Horseshoe crabs on a beach can be overturned by approaching waves. These
"stranded" crabs may right themselves by turning over. During a period of many days on
an Atlantic Ocean beach, investigators categorized a random sample of crabs as either
stranded or not stranded and additionally noted their age category. The researchers
wanted to investigate whether there is convincing evidence of an association between
becoming stranded and age. Data from their study are shown in the following table. If
becoming stranded and age are independent in these creatures, which of the following
is closest to the expected number of young stranded horseshoe crabs? - ANSWERB.
52.54
Juvenile ground squirrels respond to predators by making "alarm calls" that can alert
others to danger. A biologist conducted a study to investigate how squirrels respond to
these alarm calls: run to burrow or freeze. The biologist played recordings of alarm calls
for three samples of ground squirrels, grouped by age, and observed the squirrels'
responses. The data for the three age levels are shown in the table. If ground squirrels
at different ages respond to the alarm signals in the same proportions, what would be
the expected count for 6- to 15-day-old squirrels that freeze? - ANSWERC. ((40)(49)/98)
A study was conducted to investigate whether there are regional differences in peanut
butter preference in the United States. The country was divided into 7 geographic
regions, and in each region a random sample of peanut butter eaters were asked
whether they preferred creamy or crunchy peanut butter. The responses were
summarized in a 7-by-2 table of counts for each combination of geographic region and
creamy or crunchy peanut butter preference. Which of the following tests is the most
appropriate for the investigation? - ANSWERC. A chi-square test of homogeneity
The campus bookstore at a local university is interested in finding out whether the
textbook preference and the class level (freshman, sophomore, junior, senior) of the
student are associated. A random sample of 100 students is obtained, and each student
MCQ PART B ACCURATE 100%
"Snoqualmie" is a name shared by a waterfall and a tribe of Native Americans. In a
study of the cultural importance of the waterfall, two groups of the Snoqualmie tribe
were randomly surveyed. One group consisted of Snoqualmie members living less than
25 miles from the waterfall. Another group consisted of Snoqualmie members living
more than 25 miles from the waterfall. The researchers asked each member to rate the
cultural importance of the waterfall as low, medium, or high. Data from the study are
presented in the following table. If the distributions of ratings are the same for those
Snoqualmie members living less than 25 miles from the waterfall and those living more
than 25 miles from the waterfall, which of the following is equal to the expected count of
members living less than 25 miles from the waterfall who rated the cultural importance
as high? - ANSWERE. ((17)(50)/88)
Horseshoe crabs on a beach can be overturned by approaching waves. These
"stranded" crabs may right themselves by turning over. During a period of many days on
an Atlantic Ocean beach, investigators categorized a random sample of crabs as either
stranded or not stranded and additionally noted their age category. The researchers
wanted to investigate whether there is convincing evidence of an association between
becoming stranded and age. Data from their study are shown in the following table. If
becoming stranded and age are independent in these creatures, which of the following
is closest to the expected number of young stranded horseshoe crabs? - ANSWERB.
52.54
Juvenile ground squirrels respond to predators by making "alarm calls" that can alert
others to danger. A biologist conducted a study to investigate how squirrels respond to
these alarm calls: run to burrow or freeze. The biologist played recordings of alarm calls
for three samples of ground squirrels, grouped by age, and observed the squirrels'
responses. The data for the three age levels are shown in the table. If ground squirrels
at different ages respond to the alarm signals in the same proportions, what would be
the expected count for 6- to 15-day-old squirrels that freeze? - ANSWERC. ((40)(49)/98)
A study was conducted to investigate whether there are regional differences in peanut
butter preference in the United States. The country was divided into 7 geographic
regions, and in each region a random sample of peanut butter eaters were asked
whether they preferred creamy or crunchy peanut butter. The responses were
summarized in a 7-by-2 table of counts for each combination of geographic region and
creamy or crunchy peanut butter preference. Which of the following tests is the most
appropriate for the investigation? - ANSWERC. A chi-square test of homogeneity
The campus bookstore at a local university is interested in finding out whether the
textbook preference and the class level (freshman, sophomore, junior, senior) of the
student are associated. A random sample of 100 students is obtained, and each student
