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
lubasha [3.4K]
3 years ago
6

PRACTICE ANOTHER The administration of a large university wants to take a random sample to measure student opinion of a new food

service on campus. It plans to use a scale from 1 to 100, on which 1 is complete dissatisfaction and 100 is complete satisfaction. The administration knows from past experience with such questions that the standard deviation for the responses is going to be about 3, but it does not know what to expect for the mean. It wants to be almost sure that the sample mean is within plus or minus 1 point of the true population mean value. How large, n will the random sample have to be
Mathematics
1 answer:
Reil [10]3 years ago
3 0

Answer:

81 samples

Step-by-step explanation:

According to the empirical rule :

Possible values of the sample mean is within 3 standard deviations of the population mean :

μ ± 3 sd(x) ; sd(x) = standard deviation of sampling distribution.

3 * sd(x) = 1

sd(x) = 1/3

Recall:

Standard deviation of sampling distribution, sd(x)

sd(x) = σ / sqrt(n)

1/3 = 3 / sqrt(n)

Square both sides

1/9 = 9/n

Cross multiply :

n * 1 = 9 * 9

n = 81

You might be interested in
2(5 + y) = 18 what does y=​
jeka94
2(5+y)= 18 than y= 4
5 0
3 years ago
Read 2 more answers
Are the ratios 7:9 and 3:6 equivalent?
Cloud [144]

Answer: No

Step-by-step explanation:

7 0
2 years ago
Please help me solve this
Rashid [163]

Answer:

??????????????

Step-by-step explanation:

,nooooooo

8 0
3 years ago
ABCD is a rhombus. = 5.5 cm and = 4 cm. What is the area of the rhombus?
Angelina_Jolie [31]

The formula for solving a rhombus is A = P*Q/2


5.5×4 =22

22÷2 = 11


Awnswer: 11 cm²

3 0
3 years ago
Read 2 more answers
1. Evaluate the expression if y = 5 and z = 0
natta225 [31]

Answer:

1. 0

2. -1

3. $120

4. $653.25

5. 4ab + 7a - 2b

Step-by-step explanation:

1. y = 5, z = 0

2z/y = ?

You'll need to substitute the values of y and z in the expression

2z/y

Becomes

2 * 0 / 5

= 0

So, 2z/y equals 0

......................................................................................................................

2. x = 0, y = -1 z = 7

xz - y²

Substituting the values of x, y and z in the above algebraic expression

xz - y²

Becomes

0*7 - (-1²)

0 - 1

-1

So, xz - y² equals -1

......................................................................................................................

3. The question falls under SIMPLE INTEREST

The formula is

I = (PRT)/100

Where I represents Interest

P = Principal (Amount Invested)

R = Rate of Interest

T = Time (in years)

From the question,

The interest is unknown ----------------- (To be calculated)

P equals $600

R = 2%

T = 10 years

Substitute these values in the formula above

I = (PRT)/100

Becomes

I = (600 * 2 * 10) / 100

I = 12000/100

I = 120

Result: The interest is $120

......................................................................................................................

4.

The formula is

I = (PRT)/100

Where I represents Interest

P = Principal (Amount Invested)

R = Rate of Interest

T = Time (in years)

From the question,

The interest is unknown ----------------- (To be calculated)

P equals $13000

R = 6.7%

T = 9 months

Remember that time has to be in years

So, 9 months must be converted to year(s)

If 12 months makes a years

Then 9 months would be 9/12 years

So, T = 9/12 years

T = 0.75 years

Substitute these values in the formula above

I = (PRT)/100

I = (13000 * 6.7 * 0.75) / 100

I = 65325/100

I = 653.25

Result: The interest is $653.25

5. Simplify 4ab - 3bc + 7a - 2b + 3bc

4ab - 3bc + 7a - 2b + 3bc---------------------- Collect like terms

4ab + 7a - 2b + 3bc - 3bc

4ab + 7a - 2b

6 0
3 years ago
Other questions:
  • Please help me complete 5 and 6
    10·1 answer
  • 1. If f(x)=10- xạ, then which of the following is the value of f (-2)?
    7·1 answer
  • 99 POINTS PLS HELP Write the equation in slope-intercept form. 4x + 3y = 15
    5·2 answers
  • If you have 3 trillion dollars and a cop charges you 20,000 how much do you have left
    5·1 answer
  • Match the key aspect of a function's graph with its meaning
    13·1 answer
  • Find Integrating Fector: <br> ylogy dx + ( x-logy )dy=0
    15·1 answer
  • F(x)=2x+8 find the value of f(6)
    14·2 answers
  • I need help on this question
    7·1 answer
  • Besties help me rn
    15·1 answer
  • Can someone help me please
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!