Minimum sample sizes. a. A market researcher wishes to determine the proportion of American women who...
Minimum sample sizes.
a. A market researcher wishes to determine the proportion of American women who shop online. The results must be accurate at the 90% level of confidence with a maximum error of 2%. Calculate the minimum sample size needed to meet these requirements, given that a previous study estimated that 59% of American women shop online.
b. Emma is assigned the task of finding the mean number of hours students sleep per night. Her results must be at a 99% level of confidence with a maximum error of 0.25 hours. Assuming the standard deviation is 1.4 hours, how many students must Emma survey?
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Minimum sample sizes.
a. A market researcher wishes to determine the proportion of
American women who...
Emma is assigned the task of finding the mean number of hours students sleep per night....
Emma is assigned the task of finding the mean number of hours students sleep per night. Her results must be at a 99% level of confidence with a maximum error of 0.25 hours. Assuming the standard deviation is 1.4 hours, how many students must Emma survey?
9) A researcher wishes to estimate, with 95% confidence, the population proportion of students who did...
9) A researcher wishes to estimate, with 95% confidence, the population proportion of students who did not change their major. Her estimate must be accurate within 2.5% of the true proportion. a) What is the minimum sample size needed assuming that no prior information is available? b) What is the minimum sample size needed using a prior study that found that 34% of the students did not change their major?
nterval below within an interpretive sentence tied to the given context. 1. For a psychology experiment,...
nterval below within an interpretive sentence tied to the given context. 1. For a psychology experiment, Lola is assigned the task of finding the average number of hours U.S college students sleep each night. Her results must be at the 95% level of confidence with a previous, reliable studv). how many students must Emma survey?
please answer a - e STAT 3090 Lecture Notes Chapter 10 A researcher wishes esearcher wishes...
please answer a - e
STAT 3090 Lecture Notes Chapter 10 A researcher wishes esearcher wishes to determine whether fulltime college students get an amount of sleep different than the recommended eight hours ent than the recommended sieht hours per nicht. He takes a random sample of 52 full- hege students and finds the average number of hours slept per night to be 7.2 hours standard deviation of 1.27 hours. Does the researcher have evidence at the 5% level that...
A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think the...
A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think the president of their country can control the price of gasoline. Her estimate must be accurate within 3% of the true proportion. a) No preliminary estimate is available. Find the minimum sample size needed. b) Find the minimum sample size needed, using a prior study that found that 44% of the respondents said they think their president can control the price of gasoline. c) Compare...
A researcher wishes to estimate, with 99% confidence, the population proportion of adults who support labeling...
A researcher wishes to estimate, with 99% confidence, the population proportion of adults who support labeling legislation for genetically modified organisms (GMOs). Her estimate must be accurate within 6% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 83% of the respondents said they support labeling legislation for GMOs. (c) Compare the results from parts (a) and (b).
A researcher wishes to? estimate, with 9090?% ?confidence, the population proportion of adults who say chocolate...
A researcher wishes to? estimate, with 9090?% ?confidence, the population proportion of adults who say chocolate is their favorite ice cream flavor. Her estimate must be accurate within 33?% of the population proportion. ?(a) No preliminary estimate is available. Find the minimum sample size needed. ?(b) Find the minimum sample size? needed, using a prior study that found that 4444?% of the respondents said their favorite flavor of ice cream is chocolate. ?(c) Compare the results from parts? (a) and?...
A researcher wishes to estimate, with 99% confidence, the population proportion of adults who think Congress...
A researcher wishes to estimate, with 99% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 2% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 18% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from...
A researcher wishes to know with 95% confidence the proportion of people who own a desktop...
A researcher wishes to know with 95% confidence the proportion of people who own a desktop computer. A previous study showed that 40% of those interviewed owned a desktop. The researcher wishes to be accurate within 2% of the true proportion. Find the minimum sample size necessary.
A researcher wishes to estimate with 95% confidence, the population proportion of adults who think the...
A researcher wishes to estimate with 95% confidence, the population proportion of adults who think the president of heir country can control the price of gasoline. Her estimate must be accurate w in 4% of the true proportion. a) No preliminary estimate is available. Find the minimum sample sze needed b) Find the minimum sample size needed, using a prior study that found that 34% of the respondents said they think their president can control the price of gasoline. c)...
nterval below within an interpretive sentence tied to the given context. 1. For a psychology experiment, Lola is assigned the task of finding the average number of hours U.S college students sleep each night. Her results must be at the 95% level of confidence with a previous, reliable studv). how many students must Emma survey?
please answer a - e
STAT 3090 Lecture Notes Chapter 10 A researcher wishes esearcher wishes to determine whether fulltime college students get an amount of sleep different than the recommended eight hours ent than the recommended sieht hours per nicht. He takes a random sample of 52 full- hege students and finds the average number of hours slept per night to be 7.2 hours standard deviation of 1.27 hours. Does the researcher have evidence at the 5% level that...
A researcher wishes to estimate, with 99% confidence, the population proportion of adults who support labeling legislation for genetically modified organisms (GMOs). Her estimate must be accurate within 6% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 83% of the respondents said they support labeling legislation for GMOs. (c) Compare the results from parts (a) and (b).
A researcher wishes to estimate with 95% confidence, the population proportion of adults who think the president of heir country can control the price of gasoline. Her estimate must be accurate w in 4% of the true proportion. a) No preliminary estimate is available. Find the minimum sample sze needed b) Find the minimum sample size needed, using a prior study that found that 34% of the respondents said they think their president can control the price of gasoline. c)...
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