
7-2 Quiz Statistics
Authored by Joshua Zamora
Mathematics
12th Grade
CCSS covered
Used 3+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a study using 10 samples, and in which the population variance is unknown, the distribution that should be used to calculate confidence intervals is
a standard normal distribution.
a t distribution with 9 degrees of freedom.
a t distribution with 11 degrees of freedom.
a t distribution with 10 degrees of freedom.
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
When should the t-distribution be used to find a confidence interval for the mean?
When t is known
When σ is unknown
When n ≤ 30
When n > 30
Tags
CCSS.HSS.IC.B.4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Find tα/2 when n = 25 for the 95% confidence interval for the mean.
2.06
2.63
1.71
1.30
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A sample of size n = 14 has a sample mean x̄ = 11.9 and sample standard deviation s = 2.1. Construct a 99% confidence interval for the population mean μ.
10.4 < μ < 13.4
10.2 < μ < 13.6
11.4 < μ < 12.4
10.7 < μ < 13.1
Tags
CCSS.HSS.IC.B.4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The prices (in dollars) for a graphing calculator are shown below for 8 online vendors.
Estimate the true mean price for this particular calculator with 95% confidence.
130 157 124 124
145 136 126 144
127.7 < μ < 143.8
120.9 < μ < 150.6
125.8 < μ < 145.8
132.2 < μ < 139.3
Tags
CCSS.HSS.IC.B.4
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 15.2 oz. and the sample standard deviation is 0.70 oz., find the 95% confidence interval of the true mean.
14.6 < μ < 15.8
12.1 < μ < 18.3
14.9 < μ < 15.5
13.7 < μ < 16.7
Tags
CCSS.HSS.IC.B.4
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
5 squirrels were found to have an average weight of 8.9 ounces with a sample standard deviation is 0.9. Find the 95% confidence interval of the true mean weight.
7.8 < μ < 10.0
6.4 < μ < 11.4
8.5 < μ < 9.3
8.1 < μ < 9.7
Tags
CCSS.HSS.IC.B.4
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