00056 00526 00156 00256 reference upperright tail

0.0056
0.0526
0.0156
0.0256
Reference: upper(right) tail problem. PHStat/Two Sample Tests (summarized data)/ Separate-Variance t
Test . P-value: T.DIST.RT(t-test statistic, degrees of freedom)
Question 8 1 / 1 point
Suppose Burger King has run a major advertising campaign in the hopes of increasing monthly sales. To
investigate the effectiveness of this campaign, Burger King randomly selected seven restaurants and
recorded the monthly sales before and after the advertising. The following data represents these sales
figures in thousands of dollars.
Restaurant 1 2 3 4 5 6 7
After (Year
2012)
$127 $122 $145 $156 $160 $134 $108
Before ( Year
2011)
$107 $110 $143 $168 $145 $125 $98
Excel file with table data: 10 Q 8 Burger_King.xlsx
If Population 1 is defined as the year 2012 and Population 2 is defined as the year 2011, and using α
0.05, the critical value for this hypothesis test would be ________.
=
2.365
± 1.771

± 1.440
1.943
Reference: PHStat/Two sample tests(Unsummarized data)- Paired t Test
Question 9 1 / 1 point
The Centers for Disease Control (CDC) would like to test the hypothesis that the proportion of obese
adults in the U.S. has increased this year when compared to last year. A random sample of 120 adults this
year found that 45 were obese. Last year, a random sample of 150 adults found that 48 were obese. If
Population 1 is defined as this year and Population 2 is defined as last year, the correct hypothesis
statement for this hypothesis test would be
H
0
: p
1 -
p
2
< 0; H
1
: p
1 -
p
H
0
: p
1 -
p
2
≥ 0.
2
≠ 0
2
2
> 0.
2
< 0.
Question 10 1 / 1 point
AT&T would like to test the hypothesis that the proportion of 18- to 34-year-old Americans that own a
smartphone is less than the proportion of 35- to 49-year-old Americans. A random sample of 200 18- to

34-year-old Americans found that 126 owned a smartphone. A random sample of 175 35- to 49-year-old
Americans found that 119 owned a smartphone. If Population 1 is defined as 18- to 34-year-old
Americans and Population 2 is defined as 35- to 49-year-old Americans, the 98% confidence interval for
the difference in population proportions is ________.