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
zimovet [89]
3 years ago
14

A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a preliminary study, h

e guesses that the standard deviation of the population of weight losses is about 10 pounds. How large a sample should he take to estimate the mean weight loss to within 2 pounds, with 90% confidence?
Mathematics
1 answer:
olya-2409 [2.1K]3 years ago
4 0

Answer:

68

Step-by-step explanation:

To get the sample size of the population, we will use the formula for calculating the standard error of the mean. This is expressed as;

SE = zσ/√n

z is the z score at 90% confidence

σ is the standard deviation

n is the sample size

SE is the mean weight loss

Given

z = 1.645

σ = 10

SE = 2

Required

sample size n

Substitute into the given equation;

SE = zσ/√n

2 = (1.645)(10)/√n

2 = 16.45/√n

√n = 16.45/2

√n = 8.225

n = (8.225)²

n = 67.650625

Hence the total sample should be about 68

You might be interested in
Simplify day 19 please
Genrish500 [490]
The answer is approximately 11.18.
3 0
3 years ago
Describe the graph of y > mx, where m > 0
Dennis_Churaev [7]

The graph of y > mx, where m > 0, consists of a dashed line and a shaded half plane. The line has a positive slope and passes through the origin. The shaded half plane is above the line.

6 0
3 years ago
Read 2 more answers
True or False
kolezko [41]
True Hope this helps! ;D
5 0
3 years ago
The container that holds the water for the football team is 1/6 full. After pouring in 14 gallons of water, it is 3/4 full. How
Galina-37 [17]

We solve the equation (1/6)x + 14 = (3/4)x, where x is the number of gallons;

We have 2x/12 + 168/12 = 9x/12;

2x + 168 = 9x;

168 = 7x;

x = 168 ÷ 7;

x = 24 gallons;


4 0
3 years ago
√180 can be expressed in the form p√q. where p and q are integers. Find the smallest value of p + q. ​
frutty [35]

Answer:  

The smallest value of p+q is 11

It happens when p = 6 and q = 5.

=======================================================

Explanation:

Let's factor 180 in such a way that exactly one factor is a perfect square.

I'll ignore the trivial factor of 1.

Here are the possible factorizations we could go with:

180 = 4*45

180 = 9*20

180 = 36*5

Those factorizations then lead to the following

\sqrt{180} = \sqrt{4*45} = \sqrt{4}*\sqrt{45}= 2\sqrt{45}\\\\\sqrt{180} = \sqrt{9*20} = \sqrt{9}*\sqrt{20}= 3\sqrt{20}\\\\\sqrt{180} = \sqrt{36*5} = \sqrt{36}*\sqrt{5}= 6\sqrt{5}\\\\

Then we have

p+q = 2+45 = 47

p+q = 3+20 = 23

p+q = 6+5 = 11

The smallest value of p+q is 11 and it happens when p = 6 and q = 5.

Side note: p+q is smallest when we go with the largest perfect square factor.

6 0
2 years ago
Other questions:
  • In order to complete the service line information on claims when units of measure are involved insurance math is required. For e
    14·1 answer
  • A triangle with an area of 3 mm² is dilated by a factor of 6.
    10·2 answers
  • Erin rolls a standard number cube multiple times and records the data in the table above. At the end of the experiment, she coun
    12·1 answer
  • Which best describes the vertices
    5·1 answer
  • Jordan went to the store to buy a bicycle that was advertised for $50. When he arrived, he learned that the model he wanted was
    14·2 answers
  • A marketing research company is estimating the average total compensation of party clowns. Data were randomly collected from 48
    5·1 answer
  • Patrick saved 500$. He received 25% of the money for his birthday , saved 30% of the remainder from his allowance and earned the
    6·1 answer
  • Rock ran 3/4 of an hour on Wednesday for a distance of 4.2 miles.On Thursday, he ran for 1 hour at the same speed he ran on Wedn
    9·1 answer
  • 9x + 1 = -26 what is the value of x
    7·2 answers
  • A pharmacist has 50 g of a topical cream that contains 75% glycerine. How many grams of the cream are not glycerine?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!