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WorksheetsIvy_TESCO_Quiz 2
Total questions: 25
Worksheet time: 2hrs 5mins
The middle value of an ordered array of numbers is the
Mode
Mean
Median
MidPoint
Which of the following is not a property of the normal distribution?
It is slightly skewed left.
All central tendency measures (i.e. mean, median, mode) are of equal numerical value.
It is bell-shaped
The range is from negative infinity to positive infinity
A standard normal distribution has which of the following properties?
The mean is equal to the variance.
The mean and the variance, both equal to 1.
The mean is equal to the standard deviation.
The mean is equal to 0 and the variance is equal to 1
The area under the standardised normal curve from 0 to 1.96 would be:
equal to 0.4750
the same as the area from -1.96 to 0
both of the above
none of the above
The Central Limit Theorem tells us which of the following about the distribution of sample means?
The predicted shape of the distribution
The expected value of the mean of the distribution
The standard deviation (standard error) of the distribution
All of the above
When the sample size increases, the standard error:
increases
decreases
stays the same
is equal to sigma
For a particular population, the sampling distribution that results from sample of size 4 has a standard error of 10. For the same population, the sampling distribution that results from samples of size 16 would have a standard error of:
5
20
2.5
10
A numerical value used as a summary measure for a sample, such as a sample mean, is known as a:
Population Parameter
Sample Parameter
Sample Statistics
Population Mean
We have seen that outliers can produce problematic results. Rank the following measures in
order or “least affected by outliers” to “most affected by outliers”.
mean,median,range
median,mean,range
range,median,mean
median,range, mean
According to the empirical rule, approximately what percentage of normally distributed data
lies within one standard deviation of the mean?
59%
68%
72%
95%
The P-value for a right-tailed test is P=0.042. Which of the following is INCORRECT?
The P-value for a two-tailed test based on the same sample would be P= 0.084
The P-value for a left-tailed test based on the same sample would be P= -0.042
We would reject H0 at alpha =0.05, but not at alpha = 0.01
We would reject H0 at alpha=0.1, but not at alpha=0.04
Which of the following statement/(s) about hypothesis tests is INCORRECT?
H0 must always include equality
In a one-tailed test, H1 involves either “>” or “<“, but not “=”.
If the test statistic lies in the rejection region, we reject the H1
The critical value indicates the start of the rejection region
Which of the following represents the Confidence coefficient?
1-α
β
1-β
α
In a Binomial Distribution, if ‘n’ is the number of trials and ‘p’ is the probability of success, then the mean value is given by:
np
n
p
np(1-p)
For larger values of ‘n’, Binomial Distribution ___________
loses its discreteness
tends to Poisson Distribution
stays as it is
gives oscillatory values
Binomial Distribution is a
Continuous distribution
Discrete distribution
Irregular distribution
not a probability distribution
In a Poisson Distribution, the mean and variance are equal
True
False
For a Poisson Distribution, if mean(m) = 1, then P(X = 1) is?
1/e
e
e/2
Indeterminate
The point where the Null Hypothesis gets rejected is called as?
Significant value
Rejection value
Acceptance value
Critical value
Which of the following is defined as the rule or formula to test a Null Hypothesis?
Test statistic
Population statistic
Variance statistic
Null statistic
Type 1 error occurs when?
We reject H0 if it is False
We accept H0 if it is True
We reject H0 if it is True
We accept H0 if it is False
The probability of Type 1 error is referred as?
1-α
α
β
1-β
In a hypothesis test, what does the p value signify?
smallest level of significance for rejection of Null Hypothesis
largest level of significance for rejection of Null Hypothesis
smallest level of significance for acceptance of Null Hypothesis
smallest level of significance for acceptance of Null Hypothesis
The range of Level of Significance lies between ____________
-∞ and 0
-∞ and ∞
0 and ∞
0 and 1
Consider a trial of a criminal. If a type 1 error has occurred in the judgement then which of the following statement is true?
a guilty person is set free
an innocent person is convicted
a guilty person is convicted
an innocent person is set free
