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Wewaii [24]
3 years ago
11

- 5 choose vanilla

Mathematics
1 answer:
kozerog [31]3 years ago
6 0
66.67%, or can also be 2/3
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The U.S. Department of Transportation provides the number of miles that residents of the75 largest metropolitan areas travel per
Leya [2.2K]

Answer:

a. The point estimate of the difference between the mean number of miles that Buffalo residents travel per day and the mean number of miles that Boston residentstravel per day is 88

b. The 95% confidence interval for the difference between the two population means is (0.58171,7.21829)

Step-by-step explanation:

a. According to the given data we have the following:

Buffalo residents mean=22.5

Standard deviation=8.4

n=50

Boston residents mean=18.6

Standard deviation=7.4

n=40

Hence, the point estimate is the difference of the means=22.5-18.6=3.9

The standard error=√((s1∧2/n1)+((s2∧2/n2))=√((8.4∧2/50)+(7.4∧2/40))=1.67

Therefore, the difference of miles=n1+n2-2=50+40-2=88

The point estimate of the difference between the mean number of miles that Buffalo residents travel per day and the mean number of miles that Boston residentstravel per day is 88.

b. The critical value of t at 95% confidence level and DoF=88 is 1.987

The interval:(x1-x2)+ (critical value* std error)

=3.9-(1.987*1.67),3.9+(1.987*1.67)

Difference between mean=(0.58171,7.21829)

The 95% confidence interval for the difference between the two population means is (0.58171,7.21829)

8 0
2 years ago
Help me please this is a test ASAP 30 points ???
Serga [27]

Answer:

\frac{2}{3}x-4\frac{2}{3}

3 0
3 years ago
Read 2 more answers
Ashley has two jobs: mowing lawns and babysitting. She earns $9 per hour mowing lawns (x) and $7 per hour babysitting (y). She a
SpyIntel [72]

Answer:

The correct answer is 9x + 7 y \geq 147 where Ashley works for x hours as lawn mower and y hours as babysitter per week.

Step-by-step explanation:

Ashley works in two different jobs namely mowing lawns and babysitting.

Let Ashley mow lawn for x hours and babysit for y hours in a week.

Ashley's earning for every hour she mow is $ 9. Total earning mowing lawn is $ 9x.

Ashley earns $7 for every hour she babysit. Total earning babysitting is $ 7y.

Total earning per week $ (9x + 7y).

Ashley's earning per week is at least $147.

∴ The required inequality to describe the above case is 9x + 7 y \geq 147.

6 0
3 years ago
Read 2 more answers
Forty-two times twenty-seven
sammy [17]
1,134. :DD Hope I helped!
3 0
3 years ago
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Find the value of x<br> Round your answer to the nearest tenth.<br><br> sin 33=7/x
DaniilM [7]
The value of x is 12.9
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3 years ago
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