Plz help me with this

Brooke measures the height of her bean plant for a science project. The bean plant is 12.5 inches tall.

alisha [4.7K]

Answer:

its 31.75

Step-by-step explanation:

12.5 inch = 31.75 cm

6 0

3 years ago

What is the explicit tule for this sequence?

Oksi-84 [34.3K]

Answer:

an = 8n − 65 is the correct answer

6 0

3 years ago

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 290 babies were born, a

Ne4ueva [31]

Answer:

The 99% confidence interval estimate of the percentage of girls born is between 85.46% and 94.54%.

Usually, babies are equally as likely to be boys or girls. Here, it is desired to increase the probability of conceiving a girl, which is achieved, considering the lower bound of the confidence interval is considerably above 50%.

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:

$n = 290, \pi = \frac{261}{290} = 0.9$

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:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 - 2.575\sqrt{\frac{0.9*0.1}{290}} = 0.8546$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 + 2.575\sqrt{\frac{0.9*0.1}{290}} = 0.9454$

Percentage:

Proportion multplied by 100.

0.8546*100 = 85.46%

0.9454*100 = 94.54%

The 99% confidence interval estimate of the percentage of girls born is between 85.46% and 94.54%.

Based on the result, does the method appear to be effective?

Usually, babies are equally as likely to be boys or girls. Here, it is desired to increase the probability of conceiving a girl, which is achieved, considering the lower bound of the confidence interval is considerably above 50%.

4 0

3 years ago

6. Calculate the value of tan (48°19'23").

lisov135 [29]

Answer:

C. 1.12

Step-by-step explanation:

There are 60' (minutes) in a degree and 60" in a minute meaning that we have (60×60) seconds in a degree.

Therefore to convert seconds to degrees we divide by 3600. and minutes to degrees we divide by 60.

The angle 48°19'23'' can be converted into a decimal as follows

48°+(19/60+23/3600)°

=48.323°

Tan 48.323= 1.12

4 0

4 years ago

In 2010, the number of participants in a checkers tournament was 2.6 × 104 people. In 2013, the number of participants in a chec

Dima020 [189]

$\dfrac{5.2\cdot 10^6}{2.6\cdot 10^4}=\dfrac{5.2}{2.6}\cdot 10^{(6-4)}\\\\=2\cdot 100=200$

The number of participants increased by a factor of 200 from 2010 to 2013.

3 0

3 years ago

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