1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alex
3 years ago
12

the table shows the number of insects that eight students on a science trip collected: Alan(14),Joann(16),Kris(9),Luis (15),JP(1

2),Mario(11)nick(10,Sheila(8) find the percentile rank for Alans number of insects and for Joannas number of insects
Mathematics
1 answer:
GaryK [48]3 years ago
8 0

We have been given a table that shows number of insects collected by 8 students on a science trip.

Let us order our given data from least to greatest.  

Sheila (8), Kris (9), Nick (10), Mario (11), JP (12), Alan (14), Luis(15) and Joann (16).      

A. Let us find percentile rank for Alan's number of insects.

We will use percentile rank formula: P=100\cdot\frac{(i-0.5)}{n}, where i is rank of our data set, n is total number of our data sets.

We can see that Alan's data rank is 6 and total number of our data set is 8. Upon substituting our values in above formula we will get,  

P=100\cdot\frac{(6-0.5)}{8}

P=100\cdot\frac{(5.5)}{8}

P=12.5\cdot 5.5

P=68.75\approx69        

Therefore, percentile rank for Alan's number of insects is 68.75.

B. Let us find percentile rank for Joann's number of insects.

We can see that Joann's data rank is 8. Upon substituting our values in above formula we will get,

P=100\cdot\frac{(8-0.5)}{8}

P=100\cdot\frac{(7.5)}{8}

P=12.5\cdot 7.5

P=93.75\approx94

Therefore, percentile rank for Joann's number of insects is 93.75.  

You might be interested in
338x4 estimate then find the product
aivan3 [116]

Answer:

1360     340 x 4 = 1360

Step-by-step explanation:

8 0
3 years ago
Sean wants to spend (example) $100 on clothing and he wants to purchase 6 additional items for his wardrobe. Each pair of pants
Burka [1]

Answer: 4 Shirts and 2 Pants


15+15+15+15+20+20

or

15*4+20*2

7 0
2 years ago
Help the question says "Solve -2b – 12 = 22" and the answers are
zmey [24]

Answer:

b = -17

Plug it in to find maybe correct answer if not sure next time.

3 0
2 years ago
Read 2 more answers
A candidate for a US Representative seat from Indiana hires a polling firm to gauge her percentage of support among voters in he
UkoKoshka [18]

Answer:

a) The minimum sample size is 601.

b) The minimum sample size is 2401.

Step-by-step explanation:

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}.

The margin of error is:

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

For this problem, we have that:

We dont know the true proportion, so we use \pi = 0.5, which is when we are are going to need the largest sample size.

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

a. If a 95% confidence interval with a margin of error of no more than 0.04 is desired, give a close estimate of the minimum sample size that will guarantee that the desired margin of error is achieved. (Remember to round up any result, if necessary.)

This is n for which M = 0.04. So

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

0.04 = 1.96\sqrt{\frac{0.5*0.5}{n}}

0.04\sqrt{n} = 1.96*0.5

\sqrt{n} = \frac{1.96*0.5}{0.04}

(\sqrt{n})^2 = (\frac{1.96*0.5}{0.04})^2

n = 600.25

Rounding up

The minimum sample size is 601.

b. If a 95% confidence interval with a margin of error of no more than 0.02 is desired, give a close estimate of the minimum sample size necessary to achieve the desired margin of error.

Now we want n for which M = 0.02. So

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

0.02 = 1.96\sqrt{\frac{0.5*0.5}{n}}

0.02\sqrt{n} = 1.96*0.5

\sqrt{n} = \frac{1.96*0.5}{0.02}

(\sqrt{n})^2 = (\frac{1.96*0.5}{0.02})^2

n = 2401

The minimum sample size is 2401.

4 0
3 years ago
Horse kg of grass in 12 days how much how much does he eat in 9 days​
Zolol [24]

Step-by-step explanation:

The horse eats 9/12 in 9 days.

3 0
2 years ago
Other questions:
  • Number 16 what is the answer
    5·2 answers
  • Simplify. rewrite the expression in the form b^nb ​n ​​ b, start superscript, n, end superscript. b^{-6}\cdot b^{11}
    5·2 answers
  • Kelly is 4 feet , 3 inches tall. How many inches tall is Kelly ?
    9·2 answers
  • N - 4 = 3n + 6 Yikesss
    5·2 answers
  • Please help me out with question 2
    15·1 answer
  • 1/5(x)-2/3=4/3 what the solution for x
    7·2 answers
  • What is the area of a circle with a radius of 3.5cm
    8·2 answers
  • HELPPPP MEEE
    10·1 answer
  • Expand 2x(8x+5)<br> This is something required for me to learn and I havent got a clue
    7·1 answer
  • M(t)=120e−0.018t<br> How much mass remains after 50 years? Round to 2 decimal places.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!