WorksheetsStatistics and Probability
Total questions: 25
Worksheet time: 20mins
Which of these values is a parameter?
x
x
myu
z
What do you call to the processes involved in making conclusions about population values?
Estimating parameters
hypothesis testing
inferential statistics
descriptive statistics
Subsets of populations are called ______.
averages
estimates
elements
Samples
Which of the following best represents the central value of a set of data?
variance
average
standard deviation
proportion
What do you call a single value that may refer to a parameter value?
Z statistic
point estimate
interval estimate
T statistic
The _________ is a range of values that contains the parameter value.
Confidence limits
confidence coefficient
confidence interval
confidence level
Which of the following shows graphical results in making inferences about population values?
Pie graph
normal curve
trend line
bar graph
Which of the following are the 95% confidence coefficients?
±1.65
±1.96
±2.33
±2.58
Which of the following are the 99% confidence coefficients?
± 1.645
±1.96
±2.33
±2.58
When α=0.01, the critical values are _____.
±2.58
±2.33
±1.96
± 1.645
The maximum error of the estimate is found by ______.
Adding zα/2 by standard deviation of the sample means
Subtracting zα/2 by standard deviation of the sample means
Multiplying zα/2 by standard deviation of the sample means
Dividing zα/2 by standard deviation of the sample means
When n<30 and the population standard deviation is not known, what is the appropriate distribution?
z
t
r
p
When n≥30 and the population standard deviation is known, what is the appropriate distribution?
z
t
r
p
In a t distribution, the critical values are based on ______.
n
z
t
df
When X=50 and n=215, what is the value of ṕ?
0.23
4.3
50
215
When X=120 and n=406, what is the value of q?
0.30
20.3
120
0.70
What is the value resulting from subtracting the maximum error from the sample mean?
Lower limit of the interval estimate
upper limit of the interval estimate
Point estimate
interval estimate
Which of the following illustrates confidence level?
32.8
30-39
90%
90%-94%
The mean gasoline consumption of 10 cars is 28 liters with a standard deviation of 1.6 liters. Using 95% confidence level, what is α?
95%
28
1.6
0.05
The mean gasoline consumption of 10 cars is 28 liters with a standard deviation of 1.6 liters.Using 95% confidence level, what is the point estimate of µ?
95%
28
10
1.6
The area under the normal curve is ___.
1
0.99
0.95
0.5
In a standard normal distribution, the mean is ___ and the standard deviation is ____.
1,0
0,1
1,1
0,0
In a learning style study, 1200 respondents were asked if they can assimilate concepts while watching television. 586 said Yes. Find population proportion ṕ?
1200
586
0.51
0.49
95% is an example of confidence interval
TRUE
FALSE
An interval estimate is a range of values.
TRUE
FALSE
