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romanna [79]
3 years ago
14

A ractangle has a height to width ratio of 3:4 .5 give to example of deminsions for rectangles that could be scaled versions of

this rectangle​
Mathematics
1 answer:
dusya [7]3 years ago
8 0

36-+76590(68)/45 3638/)241

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A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 335335 babies were​ born
strojnjashka [21]

Answer:

The 99​% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

Step-by-step explanation:

Confidence Interval for the proportion:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 335, \pi = \frac{268}{335} = 0.8

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.7437

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 2.575\sqrt{\frac{0.8*0.2}{335}} = 0.8563

For the percentage:

Multiplying the proportions by 100.

The 99​% confidence interval estimate of the percentage of girls born is (74.37%, 85.63%).

Usually, 50% of the babies are girls. This confidence interval gives values considerably higher than that, so the method to increase the probability of conceiving a girl appears to be very effective.

7 0
3 years ago
Help please!! I'm having trouble with this question
Fiesta28 [93]

Answer:

the least value would be 85

Step-by-step explanation:

3 0
2 years ago
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A trail is 2 miles long. There is a marker every 1/8 mile. How many markers are there?
attashe74 [19]

Answer:

16

Step-by-step explanation:

Number of Markers =

2 \div  \frac{1}{8}  \\  = 2 \times 8 \\  = 16

8 0
3 years ago
A hiker maintains an average speed of 3 3/4 km/h. How many kilometers will the hiker walk in 5 hours
dalvyx [7]

Answer:

3 3/4 km = 1 hr

_______. ____

x 5

5 (3 3/4) = 18.75 km

5 0
2 years ago
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How many times does 25 go into 200
dimaraw [331]
25 goes into 200 exactly 8 times.
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3 years ago
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