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3 years ago

7.

Mathematics

1 answer:

kozerog [31]3 years ago

5 0

Answer:

1000+700+6+160+ 4320

Step-by-step explanation:

1 x 1000= 1000
7 x 10 = 70
6 x 1 = 6

4 x 1080= 4320
1x160

4320+1000+160+70+6

I just did it in order.

Just in case you need that added

4320+1000+160+70+6=5,556

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The average monthly cell phone bill was reported to be $50.07 by the U.S. Wireless Industry. Random Sampling of a large cell pho

zalisa [80]

Answer:

The null and alternative hypotheses are:

$H_{0}:\mu= 50.07$

$H_{a}:\mu>50.07$

Under the null hypothesis, the test statistic is:

$t=\frac{\bar{x}-\mu}{\frac{s}{\sqrt{n}} }$

Where:

$\bar{x} = 52.86$ is the sample mean

$s=7.0132$ is the sample standard deviation

$n=10$ is the sample size

$\therefore t=\frac{52.86-50.07}{\frac{7.0132}{\sqrt{10}} }$

$=1.26$

Now, the right tailed t critical value at 0.05 significance level for df = n-1 = 10-1 = 9 is:

$t_{critical}=1.833$

Since the t statistic is less than the t critical value at 0.05 significance level, therefore,we fail to reject the null hypothesis and conclude that there is not sufficient evidence to support the claim that the average phone bill has increased.

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2 years ago

11. At a delicatessen there were 20 different kinds of cheese and 30 kinds of meats. What is the ratio of cheese to meats at thi

goldfiish [28.3K]

Answer:

2 to 3 in simplest form

Step-by-step explanation:

7 0

2 years ago

A random sample of 28 statistics tutorials was selected from the past 5 years and the percentage of students absent from each on

Zielflug [23.3K]

Answer:

The 90% confidence interval using Student's t-distribution is (9.22, 11.61).

Step-by-step explanation:

Since we know the sample is not big enough to use a z-distribution, we use student's t-distribution instead.

The formula to calculate the confidence interval is given by:

$\bar{x}\pm t_{n-1} \times s/\sqrt{n}$

Where:

$\bar{x}$ is the sample's mean,

$t_{n-1}$ is t-score with n-1 degrees of freedom,

$s$ is the standard error,

$n$ is the sample's size.

This part of the equation is called margin of error:

$s/\sqrt{n}$

We know that:

$n=28$

$\bar{x}=10.41$

degrees of freedom $= 27$

$1-\alpha = 0.90 \Rightarrow \alpha = 0.10$

$t_{n-1} = 1.703$

$s = 3.71$

Replacing in the formula with the corresponding values we obtain the confidence interval:

$\bar{x}\pm t_{n-1} \times s/\sqrt{n} = 10.41 \pm 1.70 \times 3.71/\sqrt{28} = (9.22, 11.61)$

Download xlsx

8 0

2 years ago

Read 2 more answers

Evaluate 19 + 6a ÷ 2

Tresset [83]

Answer:

19 + 3a

Step-by-step explanation:

19 + 6a ÷ 2

If we want to evaluate this equation, there's really only one step.

We need to divide our 6a by our 2.

1. 19 + 6a ÷ 2 => 19 + 3a

So 19 + 6a evaluated is 19 + 3a.

Feel free to give brainliest.

Have an amazing day and happy Thanksgiving!

6 0

2 years ago

WILL MARK BRAINIEST IF RIGHT

Art [367]

Answer:

Is it C. 20/29

Step-by-step explanation:

because 20 and 29 are right next to it.

5 0

2 years ago

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