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3 years ago

How to write 9,287.373 in expanded form

Mathematics

1 answer:

Scilla [17]3 years ago

3 0

9,000 + 200 + 80 + 7 +. 3 + .07 + .003

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You apply for a job and have to take a drug test. You are curious about the error rate for the test so you do some research. You

Ber [7]

Answer:

Test statistic Z = -1.0

|Z| = |-1.0| < 1.96 at 0.05 level of significance.

The null hypothesis is accepted

The company that produces the drug test claims that less than 14% of the test results are wrong

Step-by-step explanation:

Step(i):-

Given that the population proportion P = 14% =0.14

Given that the sample size 'n' = 382 tests

Given that find a study where 47 out of 382 test results using this test were wrong (either a false positive or a false negative).

Sample proportion

$p = \frac{x}{n} = \frac{47}{382} = 0.1230$

Null hypothesis: H₀ : P = 0.14

Alternative Hypothesis:H₁ : P≠ 0.14

Step(ii):-

Test statistic

$Z = \frac{p-P}{\sqrt{\frac{PQ}{n} } }$

$Z = \frac{0.1230-0.14}{\sqrt{\frac{0.14 X0.86}{382} } }$

Z = - 1.0

|Z| = |-1.0| < 1.96 at 0.05 level of significance.

Final answer:-

The null hypothesis is accepted

The company that produces the drug test claims that less than 14% of the test results are wrong

4 0

3 years ago

In constructing a confidence interval estimate for a population mean, when we replace S with the sample standard deviation (s),

Akimi4 [234]

Answer:

Step-by-step explanation:

When the population standard deviation is unknown while constructing the confidence interval then the estimate of standard deviation calculated from sample is used and due to this the new type of variability arise and then for conducting a confidence interval for mean the t-distribution is used. For calculating confidence interval for mean there are two sampling distributions z distribution and t distribution. When sample size is small and population standard deviation is unknown then t-distribution is used.

7 0

3 years ago

Find a number if: 3/7 of it is 2 1/4

Sergeeva-Olga [200]

Answer:

x=5 1/4

Step-by-step explanation:

2 1/4= $\frac{9}{4}$ ---> $\frac{9}{4}$ divided by 3 to find 1/7x----> $\frac{3}{4}$ =1/7x---> x=21/4---> x=5 1/4

8 0

3 years ago

Read 2 more answers

Tuto

Damm [24]

Answer:

8r+8pg-pq

Step-by-step explanation:

The subtractable pg cancels out one of the 9 pg's. So 9 pg-1 pg= 8 pg

Hope this helps!

8 0

3 years ago

I'm really bad at geometry. Please help

postnew [5]

The sides of the frame are (12+2x) and (6+2x).
Its area A is 112.

Therefore by equating:
(12+2x)*(6+2x)=112
you can get the answer for x. You will obtain a quadratic equation you have to solve.

4 0

3 years ago