QUESTION 7
Suppose the observational units in a study are the patients arriving at an emergency room on a given day, 11 Nov 2019. For the following indicate whether it can legitimately be considered a variable or not:
Whether or not men have to wait longer than women
yes |
no |
5 points
QUESTION 8
A survey company published results of a survey stating that 56% of the 600 randomly sampled residents planned to set off firereworks on July 4th.
Determine the margin of error for the 56% point estimate using a 95% confidence level.
Give your answer as a decimal rounded to two decimal places. (like .02 or .07 or .12)
6 points
QUESTION 9
SAT scores (out of 2400) are distributed normally with a mean of 1480 and a standard deviation of 320. Suppose a school council awards a certificate of excellence to all students who score at least 1900 on the SAT, and suppose we pick a student at random. What is the chance they will have a score at least 1900?
(Give your answer in decimal form to 4 places, like .0304 or .1421)
6 points
QUESTION 10
Suppose the observational units in a study are the patients arriving at an emergency room on a given day, Nov 11, 2019.
Number of patients that arrive before noon
is a qualitative variable |
is a quantitative variable |
is not a variable |
4 points
QUESTION 11
Suppose the observational units in a study are the patients arriving at an emergency room on a given day, Nov 11, 2019. For the following indicate whether it can legitimately be considered a variable or not:
Blood Type
a. |
yes |
b. |
no |
Suppose you are interested in the population of all college students in the US and that you collect data from all students from FIT.
Is the following a parameter or statistic?
The proportion of your school's students who are Business Majors
a. |
parameter |
b. |
statistic |
A company claims that 80% of its customers are under 30. You suspect it is less than this. You take a random sample of 200 customers to test this and find out that 75% of your sample are under 30. What is the alternative hypothesis here?
a. |
The proportion of customers under 30 is less than 75% |
b. |
The proportion of customers under 30 is less than 80% |
c. |
The proportion of customers under 30 is equal to 75% |
A 99% confidence interval is smaller in size than a 95% confidence interval because it is more accurate.
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