Help i'm taking a math quiz

Cassie ran up 8 flights of stairs.write an integer to represent the situation

Nostrana [21]

If Cassie ran up 8 flights of stairs, the answer will be positive since she is running up the stairs not down the stairs.

So, your answer will be +8 or just 8.

5 0

3 years ago

In a sample of nequals16 lichen specimens, the researchers found the mean and standard deviation of the amount of the radioacti

Dovator [93]

Answer:

(a) The confidence level desired by the researchers is 95%.

(b) The sampling error is 0.001 microcurie per millilitre.

(c) The sample size necessary to obtain the desired estimate is 36.

Step-by-step explanation:

The mean and standard deviation of the amount of the radioactive element, cesium-137 present in a sample of n = 16 lichen specimen are:

$\bar x=0.009\\s=0.003$

Now it is provided that the researchers want to increase the sample size in order to estimate the mean μ to within 0.001 microcurie per millilitre of its true value, using a 95% confidence interval.

The (1 - α)% confidence interval for population mean (μ) is:

$CI=\bar x \pm z_{\alpha/2}\times \frac{s}{\sqrt{n}}$

(a)

The confidence level is the probability that a particular value of the parameter under study falls within a specific interval of values.

In this case the researches wants to estimate the mean using the 95% confidence interval.

Thus, the confidence level desired by the researchers is 95%.

(b)

In case of statistical analysis, during the computation of a certain statistic, to estimate the value of the parameter under study, certain error occurs which are known as the sampling error.

In case of the estimate of parameter using a confidence interval the sampling error is known as the margin of error.

In this case the margin of error is 0.001 microcurie per millilitre.

(c)

The margin of error is computed using the formula:

$MOE=z_{\alpha/2}\times \frac{s}{\sqrt{n}}$

The critical value of z for 95% confidence level is:

$z_{\alpha/2}=z_{0.05/2}=z_{0.025}=1.96$

*Use a z-table.

Compute the sample size value as follows:

$MOE=z_{\alpha/2}\times \frac{s}{\sqrt{n}}$

$n=[\frac{z_{\alpha/2}\times s}{MOE}]^{2}$

$=[\frac{1.96\times 0.003}{0.001}]^{2}$

$=34.5744\\\approx36$

Thus, the sample size necessary to obtain the desired estimate is 36.

8 0

3 years ago

. Macy's mom gives her $100 for her birthday. She buys shirts that're $15 each and pairs of pants that're $25 each. Which expres

Pachacha [2.7K]

Answer:

100-(15s+25p)

Step-by-step explanation:

5 0

2 years ago

your reading material traces an example that shows how a giant like wal-mart can make it difficult for small sellers. In this ca

ioda

Because we do not have the same reading material as you do, we do not know the solution. In addition to that, you are posting the question in the wrong section. This is an economics question. Refer to your required text for the class for the solution.

8 0

3 years ago

Read 2 more answers

Mr.Hamilton gave out 15 coupons per hour at the appliance show. After 2 days at the show, working 14 hours total, how many coupo

Lapatulllka [165]

Me Hamilton gave 210 coupons two days is throw you off because total was 24 so 14 times 15

7 0

4 years ago