Question
Please answer these questions: 1-As the confidence level increases , what happens to the width of the confidence interval? -It gets narrower -There isn't enough
Please answer these questions:
1-As the confidence level increases, what happens to the width of the confidence interval?
-It gets narrower
-There isn't enough information to tell.
-It stays the same width
-It gets wider.
2-If we use a larger sample size, what happens to the width of the confidence interval?
-It stays the same width.
-There isn't enough information to tell.
I-t gets narrower.
-It gets wider.
3-What would you need to change in a study to cut the margin of error in half?
Explain:
4-If our sample data are less variable (more minor sample standard deviation, s), what happens to the width of the confidence interval?
-It gets narrower.
-There isn't enough information to tell.
-It stays the same width.
-It gets wider.
5-In the Night Lights and Nearsightedness study, what are the observational units?
-The children
-The night lights
-The parents
6- here are two variables to consider in the Night Lights and Nearsightedness study, identify and classify both of the variables.
-Variable 1: Whether the child slept with a room light, a night light or in darkness (categorical)
-Variable 2: Whether or not the child was nearsighted. (categorical)
-Variable 1: Whether the child slept with a room light, a night light or in darkness (quantitative)
Variable 2: Whether or not the child was nearsighted. (quantitative)
-Variable 1: The percentage of children that slept with a nightlight (quantitative)
Variable 2: The percentage of children that were nearsighted. (quantitative)
7-Identify each of the variables in the study as an explanatory variable or a response variable.
-Explanatory: Whether the child slept with the room light, a night light, or in darkness.
Response: Whether or not the child was nearsighted.
-Explanatory: Whether or not the child was nearsighted.
Response: Whether the child slept with the room light, a night light, or in darkness.
-Explanatory: The percentage of children that slept with a nightlight
Response: The percentage of children that were nearsighted.
-Explanatory: The percentage of children that were nearsighted.
Response: The percentage of children that slept with a nightlight.
8-Although it is possible that the lighting conditions directly impacted the children's eye conditions, identify at least two alternative explanations for the children's nearsightedness.
Explanation:
9-Imagine that you are planning a study to look for an association between overall health (good, fair, not good) and having a pet.
Which variable would be explanatory, and which would be the response?
-Explanatory: The overall health of the person.
Response: Whether or not the person has a pet.
-Explanatory: Whether or not the person has a pet.
Response: The overall health of the person.
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