Deck 8: Sampling Variability Sampling

Question 1

Based on past experience researchers had theorized that about 0.56 of respondents
would cite reduction of benefits as a potential barrier. Based on the given data, is it
reasonable to conclude that this proportion for all women pediatrics residents differs
from 0.56?

Answer 1

Question 2

Answer 2

False

Question 3

Answer 3

False

Question 4

Question 5

Question 6

Suppose you are interested in the value of p, the proportion of all women pediatrics
residents for whom loss of income would be a barrier to part-time work. This
proportion can be estimated using the sample proportion, ˆp . What is the sample
proportion for this sample?

Question 7

Question 8

Question 9

Question 10

In a balanced ecosystem, all animals are subject to predators. Bees have been observed avoiding flowers where spiders have been present, but it is not known how they detect the spider’s presence. A series of studies involving Italian honeybees and crab spiders was conducted to address this question. One study looked at flowers that had a dead bee on its petals. In a sample of 128 bee flights to flowers with dead bees, 83 resulted in the bee inspecting the flower, and 38 of these inspections resulted in the bee “accepting” the
flower.
In prior studies with different species of bees, about 70% of flowers containing dead bees had resulted in acceptance of the flower. Based on the given data, is it reasonable to conclude that the proportion of landings of Apis mellifera is different
from 0.70?

Question 11

Question 12

Question 13

A statistic is a characteristic of a population.

Question 14

Question 15

Question 16

In a balanced ecosystem, all animals are subject to predators. Bees have been observed avoiding flowers where spiders have been present, but it is not known how they detect the spider’s presence. A series of studies involving Italian honeybees and crab spiders was conducted to address this question. One study looked at flowers that had a dead bee on its petals. In a sample of 128 bee flights to flowers with dead bees, 83 resulted in the bee inspecting the flower, and 38 of these inspections resulted in the bee “accepting” the
flower.
Based on what you know about the sampling distribution of ˆp , is it reasonable to think that this estimate is within 0.05 of the actual value of the population proportion? Explain why or why not.

Question 17

In a balanced ecosystem, all animals are subject to predators. Bees have been observed avoiding flowers where spiders have been present, but it is not known how they detect the spider’s presence. A series of studies involving Italian honeybees and crab spiders was conducted to address this question. One study looked at flowers that had a dead bee on its petals. In a sample of 128 bee flights to flowers with dead bees, 83 resulted in the bee inspecting the flower, and 38 of these inspections resulted in the bee “accepting” the
flower.
Suppose you are interested in learning about the value of p, the proportion of all flowers with bee remains that would be inspected. This proportion can be estimated using the sample proportion, ˆp . What is the sample proportion for this sample?

Question 18

Based on what you know about the sampling distribution of ˆp , is it reasonable to
think that this estimate is within 0.05 of the actual value of the population proportion?
Explain why or why not.

Question 19

Question 20

Question 21

Question 22

Question 23

In a study of texting and driving, 48% of 300 adults surveyed said that they text and
drive. Forty-four percent of 300 teens surveyed said that they text and drive. It is
reasonable to regard these samples (adult drivers and teen drivers) as representative of
the corresponding populations.

Question 24

Question 25

T