1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
muminat
3 years ago
8

The owners of Shaving Ice are concerned that many of their customers are starting to purchase their icy treats from Cold as Ice

because of its new shaved-ice syrup, which has fewer grams of sugar than Shaving Ice. A random sample of 100 strawberry shaved ices from Shaving Ice found a mean of 22 grams of sugar and a standard deviation of 3.2 grams. A random sample of 100 strawberry shaved ices from Cold as Ice found a mean of 18 grams of sugar and a standard deviation of 2.1 grams. Which of the following formulas gives a 99% confidence interval for the difference in mean grams of sugar between a Shaving Ice strawberry shaved ice and a Cold as Ice strawberry shaved ice?

Mathematics
1 answer:
harkovskaia [24]3 years ago
4 0

Answer:

The correct option is;

4\pm 2.63}\sqrt{\frac{3.2^{2}}{100}+\frac{2.1^{2}}{100}}

Step-by-step explanation:

Here we have the formula for the confidence interval of the difference of two means where the population standard deviation is unknown based on the sample mean and sample standard deviation is given as follows;

\left (\bar{x}_{1}- \bar{x}_{2}  \right )\pm t_{\alpha /2}\sqrt{\frac{s_{1}^{2}}{n_{1}}+\frac{s_{2}^{2}}{n_{2}}}

Where:

\bar{x}_{1} = Mean of the first sample = 22 grams

\bar{x}_{2} = Mean of the second sample = 18 grams

s₁ = Sample standard deviation of the first sample = 3.2 grams

s₂ = Sample standard deviation of the second sample = 2.1 grams

n₁ = Sample size of the first sample = 100

n₂ = Sample size of the second sample = 100

t_{\alpha /2} = t value obtained from tables at 99% confidence level and 100 degrees of freedom = 2.626 = 2.63

Therefore, plugging in the values, we have;

\left (22- 18  \right )\pm 2.63}\sqrt{\frac{3.2^{2}}{100}+\frac{2.1^{2}}{100}} = 4\pm 2.63}\sqrt{\frac{3.2^{2}}{100}+\frac{2.1^{2}}{100}}

Therefore, the correct option is 4\pm 2.63}\sqrt{\frac{3.2^{2}}{100}+\frac{2.1^{2}}{100}}.

You might be interested in
Robby age 4 potato chips. Jimmy ate p times as many potato chips. Which expression shows how many potato chips jimmy ate?
egoroff_w [7]

Answer:

The answer is 4 x p.

Hope this helps! :)

8 0
3 years ago
Why is it important to know how to estimate quotients?
Zigmanuir [339]
In the real world you are not going to have a calculator on you 24/7. Nor will you have a pencil or paper to do longhand. You need to know how to accurately estimate your answers in order to be successful.
8 0
3 years ago
The equation of a circle is (x + 6)^2 + (y - 4)^2 = 16. The point (-6, 8) is on the circle.
pantera1 [17]

Answer:

y = 8 is the equation of tangent.

Step-by-step explanation:

The equation of the tangent to the circle at (-6,8) is of the form:

y = mx + c

where m is the slope of the tangent and c is the y-intercept.

The point (-6,8) lies on the circle and the tangent line as well.

Hence (-6,8) satisfies the line equation:

8 = m(-6) + c ⇒ c-6m = 8 -------------1

We know that slope of two perpendicular lines are related as:

m_{1}\times m_{2}=-1

At any point on the circle, the normal line at a point is always perpendicular to the tangent line at that point.

Hence :

m_{normal} \times m_{tangent}=-1

We can find the slope of the normal at point (-6,8) as it passes through the centre of the circle (-6,4) by using the two-points formula for slope.

m=\frac{y_2-y_1}{x_2-x_1}

         =\frac{8-4}{-6+6}

          = ∞

Slope of the normal is infinity and hence slope of tangent is -1/∞ = 0

Hence m=0

Putting m=0 in equation 1 we get:

c = 8

The equation of tangent line at (-6,8) is:

y = 8

6 0
3 years ago
A train traveled 720km in 9h. How far would it travel in 11 hr? How long would it take to go 1120km?
kompoz [17]
It would go 880 km in 11 hours, and it would take 14 hours to go 1120 km
6 0
3 years ago
Read 2 more answers
If I weighed 12 stones and lost 5lb , how much would I weigh?​
mamaluj [8]

Answer: 163 pounds

Step-by-step explanation: 12 stones is 168 pounds

4 0
3 years ago
Read 2 more answers
Other questions:
  • I need help<br>22 - 3b = 7
    9·1 answer
  • Diketahui persaman 5x-11=2x+7.nilai dari x+4 adalah
    10·1 answer
  • A teacher is making identical packets using 92 crayons and 23 sheets of paper. What is the greatest number of packets she can ma
    13·2 answers
  • Substituting y = –2 back into the first equation gives
    11·2 answers
  • A rectangular area is to be enclosed by a wall on one side and fencing on the other three sides. If 18 meters of fencing are use
    5·1 answer
  • Choose the graph which matches the function f(x) 2^x+2
    5·2 answers
  • Which equation represents the graphed function?
    8·1 answer
  • IL GIVE BRAINLIST!! PLEASE HELP! THERES 2 ANSWERS JUST SAYING!!​
    9·1 answer
  • Help me solve this question
    6·1 answer
  • Someone help me Asap please!!
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!