For each of the following statements, determine whether it is true or false. Dot not give
explanation.
The mode of a categorical variable is the category with the most items.
For each of the following statements, determine whether it is true or false. Dot not give
explanation.
For each of the following statements, determine whether it is true or false. Dot not give
explanation.
Using X -bar chart and S -chart that set control limits at ±3 standard errors,
when the process is under control, we are more likely to signal a problem falsely if
we are using both the X -bar chart and S -charts then using only X -bar chart.
For each of the following statements, determine whether it is true or false. Dot not give
explanation.
A market research assistant watches the next five customer as they leave the store.
He records whether the customer is carrying a store bag that indicates the customer
made a purchase. He writes down a ‘yes’ or a ‘no’ for each. Then the sample space
for this experiment has 10 elements.
For each of the following statements, determine whether it is true or false. Dot not give
explanation.(四) A market research assistant watches the next five customer as they leave the store.
He records whether the customer is carrying a store bag that indicates the customer
made a purchase. He writes down a ‘yes’ or a ‘no’ for each. Then the sample space
for this experiment has 10 elements.
Refer to (四). The assumption of independence means that each shopper has the
same probability for carrying a bag.
Thirty randomly selected statistics students were given 12 multiple-choice
questions and 12 open-ended questions all on the same material. The professor was
interested in determining which type (multiple-choice or open-ended) of questions
the students scored higher. Then this experiment is an example of
a one-sample z test of means.
a two-sample t test of means.
a two-sample test of proportions.
a paired t-test.
(一)Thirty randomly selected statistics students were given 12 multiple-choice
questions and 12 open-ended questions all on the same material. The professor was
interested in determining which type (multiple-choice or open-ended) of questions
the students scored higher. Then this experiment is an example of
Refer to (一). This experiment an example of
a one-tailed test.
a two-tailed test.
If the rate of change from one period to the net is a constant percent, then which
one of the following statements is correct?
A log transformation is used.
A linear trend equation is used.
The slope of the trend line will be negative.
The episodic variation will always be less than 1.00.
What percent of households have income less than 1,500?
Which is larger, the IQR (inter quartile range) or the SD (standard deviation)? Why?
Every now and then even a good diamond cutter has a problem and the diamond breaks.
For one cutter, then rate of break is 0.15% If the cutter works on 60 stones, what
probability model (binomial distribution, hypergeometric distribution, or Poisson
distribution) seems well suited to this problem? Why?
Japanese environment researchers studied the performance of truss-and-frame structures
subjected to uncertain loads. The load was assumed to have a normal distribution with a
mean of 20 pounds. Also, the probability that the load is smaller than 30 pounds is 67%.
Please find the standard deviation of the load distribution. Show your work.
A political candidate is anxious about the outcome of the election. To have his next
survey result produce a 95% confidence interval with margin of error of no more than
0.025, how many eligible voters are needed in the sample? Show your work.
Please fill in the missing values in the table.
What does the F in the third row (Age*Book of Ride) of the ANOVA table test?
Please give the null and alternative hypotheses, and your conclusion. Take
α = 0.05 .
Please predict the amount of damage if a major residential fire were to occur 3.5
miles from the nearest fire station. Show your work.
Please calculate the Pearson’s correlation between the damage (x) and the
distance ( y) . Show your work.
Under the null hypothesis that there is no association between the group and the
amount of trust, please calculate the expected count for the cell in group scientist
and some trust. Show your work.
Suppose a Chi-Squared test is performed. What is the degrees of the freedom for
the test of the null hypothesis of independence?
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