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WorksheetsStat and probab
Total questions: 50
Worksheet time: 39mins
It is a measure of position that divides the data into four equal parts.
Mean
Median
Quartile
Decile
It measures the number of individual samples measured or observations used in a survey or experiment
Population
Sample size
Standard deviation
Variance
What process is involved in making conclusions about population values?
Inferential statistics
Hypothesis testing
Descriptive statistics
estimating parameters
What do you call a number that describes the characteristics of a population?
Decimal
Sample Statistics
Parameter
Interval
Which of the following statement is a characteristics of the t distribution?
It is a continuous distribution.
It has a mean of 0
It is symmetrical
All of the above
Which of the following illustrates confidence level?
5.0
99%
90-95
.05
We wish to develop a confidence interval for the population mean. The population follows the normal distribution, the standard deviation of the population is 3, and we have a sample of 100 observations. What is the appropriate value of" z", if we use 90% confidence level?
z= 1.64
z=1.96
t=1.833
t=2.262
Which of the following refers to the fraction of sample possessing a certain trait?
population
mean
confidence interval
proportion
Which of these is a correct alternative hypothesis for two tailed test?
Ho: μ = 9
Ha: μ = 9
Ho: μ ≠ 9
Ha: μ ≠9
1-β, is the probability of which kind of error?
Type I
Type II
Type A
Type B
When n< 30 and the population standard devaition is known, what is the appropriate distribution?
z
p
t
r
Under the normal distribution, what is the z- value that corresponds to an area of 0.4967
z= ±2.72
z= ±1.98
z=±2.7
z= ±.072
Alpha α, is the probability of which kind of error?
Type I
Type II
Type A
Type B
What is the value of α for the 95% confidence level?
α = .05
α= .10
α= 0.01
α= .025
When x= 60 and n=125 what is the value of p̂?
0.48
0.84
0.52
2.08
If p̂ = 0.23 what is q?
0.32
0.77
0.87
0.97
The researcher wants to examine 12 respondents for their study. What is the degree of freedom?
98%
11
12
.012
What is the margin of error E, if n= 120, σ= 3 and confidence level of 95%.
0.52
0.54
0.56
0.58
Under the normal curve, when lines are drawn through these values, they separate the rejection region from the acceptance region.
confidence coefficients
computed statistics
z-values
t-values
Which of the following represents the middle part under normal curve?
Confidence level
Confidence interval
Acceptance region
Rejection region
The mean gasoline consumption of 10 cars is 28 liters with the standard deviation of 1.6 liters. Use the 95 % confidence level. What is the α ?
95%
28
1.6
0.05
The mean gasoline consumption of 10 cars is 28 liters with the standard deviation of 1.6 liters. Use the 95 % confidence level. What is the point of estimate?
95%
28
1.6
.05
The mean gasoline consumption of 10 cars is 28 liters with the standard deviation of 1.6 liters. Use the 95 % confidence level. What is the appropriate distribution?
Z
P
T
S
The mean gasoline consumption of 10 cars is 28 liters with the standard deviation of 1.6 liters. Use the 95 % confidence level. What is the t value?
± 1.96
± 2.26
± 2.33
± 2.58
The mean gasoline consumption of 10 cars is 28 liters with the standard deviation of 1.6 liters. Use the 95 % confidence level. What is the lower confidence interval?
27
26.85
26.81
26.68
The mean gasoline consumption of 10 cars is 28 liters with the standard deviation of 1.6 liters. Use the 95 % confidence level. What is the upper confidence interval?
29
29.14
29.19
29.32
Deo wants to replicate a study where the lowest observed value is 12.4 while the highest is 12.8. He wants to estimate the population mean within an error of its true value. Using 99% confidence level. What is zα∕² ?
1.65
2.96
1.98
2.58
A businessman,believes that using a new marketing strategy will yield greater income in his company. The average income of his compnay from the past was P 3,500,000 per year. What is the null hypothesis in symbols?
Ho : μ ≥ 3, 500,000
Ho : μ ≠ 3, 500,000
Ha : μ = 3, 500,000
Ha : μ > 3,500,000
A businessman,believes that using a new marketing strategy will yield greater income in his company. The average income of his company from the past was P 3,500,000 per year. What is the alternative hypothesis in symbols?
Ho : μ = 3, 500,000
Ho : μ ≠ 3, 500,000
Ha : μ > 3,500,000
Ha : μ < 3,500,000
What is the two tailed of 90 % confidence level?
1.28
1.64
1.96
2.33
if the sample size n id 23 what is the degree of freedom?
21
22
23
24
What is the one tailed of 90% confidence level?
1.28
1.64
1.96
2.33
What is the two tailed of alpha error .05?
1.28
1.64
1.96
2.33
Given the alpha error of 1% what is the two tailed?
1.28
1.64
1.96
2.58
It is called the subgroup of a target population.
statistics
t-test
z-test
sample
It is a distribution of value less than 30.
z distribution
t distribution
f distribution
alpha error
When α= 0.01 , the critical values is:
1.64
1.96
2.33
2.58
In a t distribution, the critical values are based on:
n
z
t
df
In learning style study, 1200 respondents were asked if they can assimilate concepts while watching television. 586 said yes. Using the 95% confidence level what is the alpha error?
95%
0.01
0.05
0.10
In learning style study, 1200 respondents were asked if they can assimilate concepts while watching television. 586 said yes. Using the 95% confidence level what is the confidence coefficients?
1.96
2.26
2.33
2.58
In learning style study, 1200 respondents were asked if they can assimilate concepts while watching television 586 said yes. Using the 95% confidence level what "X"?
1200
586
0.49
none of theses
In learning style study, 1200 respondents were asked if they can assimilate concepts while watching television. 586 said yes. Using the 95% confidence level what "n"?
1200
586
0.49
none of these
In learning style study, 1200 respondents were asked if they can assimilate concepts while watching television. 586 said yes. Using the 95% confidence level what "p̂"?
1200
586
0.49
none of these
Which of the following gives the second step in hypothesis testing?
Select appropriate test statistic
State decision rule for rejecting or not rejecting the null hypothesis
Describe the population parameter of interest
Formulate the hypothesis; the null hypothesis and the alternative hypothesis
Which of the following gives the first step in hypothesis testing?
Select appropriate test statistic
Describe the population parameter of interest
State decision rule for rejecting or not rejecting the null hypothesis
Formulate the hypothesis; the null hypothesis and the alternative hypothesis
Supposed that z is the test statistic, what is the value of z if μ=94, σ=8, n=100, x̄= 97?
3.57
-3.57
3.75
-3.75
Supposed that z is the test statistic, what is the value of z if μ=52, σ=7, n=120, x̄= 49.6?
3.57
3.75
-3.57
-3.75
Supposed the z computed value is greater that the z critical , what decision should be take?
reject the null hypothesis
reject the alternative hypothesi
do not reject null hypothesis
none of these
The t computed value is 2.48, and the confidence level is 90%, two tailed with a sample size of 13. What is the decision should be take?
reject the null hypothesis
do not reject null hypothesis
reject the alternative hypothesis
none of these
Do you want to pass on my subject?
yes
no
sort of
maybe
