Product sales since 2001 are:
The least squares trend equation is given as:
Ŷ = 100 + 28t, where t is set equal to 1 for 2001.
What were the predicted sales in 2006?
A geometric mean is useful to compute the average percent change over _______.
A university wants to determine the proportion of students who use a cash card to pay at
the university food service. Out of 100 students surveyed, 65 students use a cash card.
What is the 95% confidence interval for the population proportion?
Six people have declared their intentions to run for a seat on the school board in the
next local election. A poll is conducted during the campaign among 1,020 randomly
sampled voters to determine if there is any clear preference among the voters. The
responses are shown next.
What is the alternative hypothesis?
A multiple regression analysis showed the following ANOVA table result.
Based on the information in the ANOVA, what is the decision regarding the global null
hypothesis?
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 alternate hypothesis?
A sample of the homes currently offered for sale revealed that the mean asking price is
$75,900, the median is $70,100, and the modal price is $67,200. The standard deviation
of the distribution is $5,900. What is Pearson’s coefficient of skewness in this sample?