In a tree diagram that illustrates the joint probabilities for a probability problem, the
sum of all the joint probabilities must equal _______________.
Draw a Venn diagram showing the probability for two mutually exclusive events and
also draw a Venn diagram showing the probability for two events that are not mutually
exclusive. Explain the difference in the two diagrams.
The Spearman coefficient of rank correlation requires that observations be _______.
The standard deviation of the sampling distribution of the sample means is called 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.
At the 5% level of significance, what is the critical value?
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 proportion of people who purchased soda in Region A?
If π = 1/3 and n = 900, the mean of this binomial distribution is ______.