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Gre4nikov [31]
3 years ago
9

A recent survey of cell phone users indicated that 56 percent of the respondents prefer to use cell phones for texting rather th

an for making phone calls. A 95 percent confidence interval for the estimate of all cell phone users who prefer to use cell phones for texting has a margin of error of 3 percent.
Assume al contions for inference have been met. Based on the confidence where which of the following claim is supported?

A. Less than half of all people prefer texting
B. More than half of all people prefer texting
C. At least 60 percent of all people prefer texting
D. At least 75 percent of all people prefer texting
E. At least 95 percent of all people prefer texting
Mathematics
2 answers:
levacccp [35]3 years ago
8 0

Given Information:

mean = μ = 56%

margin of error = σ = 3%

Confidence Level = 95%

Required Information:

Range of mean with 95% confidence Level = ?

Answer:

Range of mean with 95% confidence Level = 50% to 62%

Step-by-step explanation:

We know that within 95 % confidence interval, the data will fall within 2 standard deviations from the mean

μ ± 2σ

We have mean μ = 0.56 and standard error σ = 0.03

0.56 + 2*0.03 and 0.56 - 2*0.03

0.56 + 0.06 and 0.56 - 0.06

0.62 and 0.50

or

50% to 62%

Conclusion:

Since the percentage is 50 or greater, option B best fits the scenario, more than half of all people prefer texting

We are 95% confidence that 50 to 62 % of the the respondents prefer to use cell phones for texting rather than for making phone calls.

mrs_skeptik [129]3 years ago
6 0

Answer:

(B) More than half of all people prefer texting.

Step-by-step explanation:

Confidence interval for a proportion is given as sample proportion +/- margin of error

sample proportion (p) = 56%

margin of error (E) = 3%

Lower limit = p - E = 56% - 3% = 53%

Upper limit = p + E = 56% + 3% = 59%

The percentage of half of all people is 50%

95% confidence interval of the proportion of all people who prefer texting is (53%, 59%). This interval shows that more than half of all people prefer texting.

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Answer:

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When n = 6, the equation equals 52. This means that you have $52 left after purchasing 6 albums.

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3 years ago
In the mall, 1/15 of the stores sell shoes. there are 180 stores in the mall. how many of the stores sell shoes
nordsb [41]
Take 180 * (1/15) = 12 shoe stores
8 0
3 years ago
What is the slope of (-1,6) and (2,3)?
LenKa [72]

Answer:

-1

Step-by-step explanation:

For a line joining two points (x1, y1) and (x2, y2), it's slope is given as:

\boxed{ \mathsf{slope =  \frac{ y_{2} -y  _{1}}{ x_{2} - x _{1}} }}

Here, the two points are (-1, 6) and (2, 3) in place of (x1, y1) and (x2, y2).

Solving for slope:

\implies \mathsf{ \frac{3 - 6}{2 - ( -1 )} }

\implies \mathsf{ \frac{ - 3}{2  + 1 } }

\implies \mathsf{ \frac{ - 3}{3 } }

\implies \mathsf{  - 1 }

Hence, the slope of the line joining the given points is <u>-1.</u>

4 0
3 years ago
4. If you spin the spinner twice, what is the probability that the spinner will land on 5 on the first spin and 2 on the second
uysha [10]

Answer:

1/16

Step-by-step explanation:

Given in comment:

5,4,3,2 = Spinner

Thus, there are 4 possible answer

Given:

If you spin the spinner twice, what is the probability that the spinner will land on 5 on the first spin and 2 on the second spin?

1/16

3/16

1/8

1/4

Solve:

Knowing that there only <u>One 5 and One 2 on the spinner.</u>

Thus, in fraction form - 1/4 and 1/4

Probability land on 5 = 1/4

Probability land on 2 = 1/4

Because there are 4 possible solution and one of each is 5,4,3,2

Now, multiply then together:

1/4 × 1/4 = {1 ×1 = 1 and 4 × 4 = 16}

Put Together:

1/16

Hence, the answer is " The Probability that the spinner will land on 5 on the first spin and 2 on the second spin is 1/16  

<em>~Lenvy~</em>

5 0
2 years ago
Read 2 more answers
How do I do this please explain step-by-step!!
dedylja [7]

Answer:

3231433245

Step-by-step explanation:

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