A company is researching the effectiveness of a new website design to decrease the
time to access a website. Five website users were randomly selected and their times (in
seconds) to access the website with the old and new designs were recorded. The results
follow.
What is the value of the test statistic to test for differences in the times?
To summarize the gender of students attending a college in a frequency distribution, a
total of at least ______ classes would be required.
To compare the effect of weather on sales of soft drinks, a distributor surveyed people
in two regions of the country and asked if they purchased soft drinks in the last month.
The following are the results. The distributor would like to know if there is a difference
in sales between the two regions.
What is the null hypothesis?
The paired difference test has ___________ degrees of freedom.
For the following probability distribution:
The mean is _____________.
To compare the effect of weather on sales of soft drinks, a distributor surveyed people
in two regions of the country and asked if they purchased soft drinks in the last month.
The following are the results. The distributor would like to know if there is a difference
in sales between the two regions.
What is the pooled estimate of the population proportion?
A frequency distribution for nominal data requires that the categories be
___________________ and _____________________.
What is the advantage of using ANOVA to test for differences among treatment means
rather than testing all possible pairs of treatment means?
For a two-tailed hypothesis test, the computed test statistic is z = 2.65. What is the
p-value?
One card will be randomly selected from a standard 52-card deck. The probability that
it will be the jack of hearts is ____.
A chart that shows the relationship between a continuous dependent variable and a
continuous independent variable is called a ____________.
In plotting paired data in a scatter diagram, the dependent variable is scaled on the
__________________.
A survey of property owners’ opinions about a street-widening project was taken to
determine if owners’ opinions were related to the distance between their home and the
street. A randomly selected sample of 100 property owners was contacted and the
results are shown next.
This classification is summarized with what kind of table?
Sugar is packaged in 16-ounce bags. To test the weight of the bags, a few were checked.
The mean weight was 15.95 ounces and the standard deviation was 0.5 ounces. How
many bags must the processor sample to be 99% confident that the sample mean does
not differ from the population mean by more than 0.2 ounces?
When planning an experiment, how is a significance level related to sample size?
The relationship between interest rates as a percent (X) and housing starts (Y) is given
by the linear equation Ŷ = 4094 – 269X. At what interest rate will there be no permits
for housing starts?
For the following probability distribution:
The variance is _____________.