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sukhopar [10]
3 years ago
9

Answer this for me please

Mathematics
1 answer:
babymother [125]3 years ago
5 0
The answer is A is cross the x axis at (2.2) :)
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We wish to give a 90% confidence interval for the mean value of a normally distributed random variable. We obtain a simple rando
coldgirl [10]

Answer: (9.27025,\ 11.12975)

Step-by-step explanation:

Given : Sample size : n= 9

Degree of freedom = df =n-1 =8

Sample mean : \overline{x}=10.2

sample standard deviation : s= 1.5

Significance level ; \alpha= 1-0.90=0.10

Since population standard deviation is not given , so we use t- test.

Using t-distribution table , we have

Critical value = t_{\alpha/2, df}=t_{0.05 , 8}=1.8595

Confidence interval for the population mean :

\overline{x}\pm t_{\alpha/2, df}\dfrac{s}{\sqrt{n}}

90% confidence interval for the mean value will be :

10.2\pm (1.8595)\dfrac{1.5}{\sqrt{9}}

10.2\pm (1.8595)\dfrac{1.5}{3}

10.2\pm (1.8595)(0.5)

10.2\pm (0.92975)

(10.2-0.92975,\ 10.2+0.92975)

(9.27025,\ 11.12975)

Hence, the 90% confidence interval for the mean value= (9.27025,\ 11.12975)

6 0
3 years ago
PLEASE HELP. 18 points
Maksim231197 [3]
4 because when u solve it that’s what you get
3 0
3 years ago
Two consecutive whole numbers are n-1 and n
Orlov [11]

a. n-(n - 1) = 1

b. n( n - 1) = n² - n

c. (n - 1) + n = 2n - 1

d. (n - 1) + n = 2n - 1

<h3>Solution:</h3>

General Rule for Equation Solving

  • Remove parentheses and combine like terms to simplify each side of the equation.
  • To isolate the variable term on one side of the equation, use addition or subtraction.
  • To find the variable, use multiplication or division.

Given two consecutive numbers , (n - 1) , n

simplifying :

n - (n - 1)

= n -1(n - 1)

= n - n + 1

= 1

multiplying :

n( n -1)

= n² - n

simplifying :

(n-1) + n

= n - 1 + n

= 2n -1

by adding two numbers :

(n - 1) + n

= n -1 + n

= 2n - 1

To learn more about equations refer to :

brainly.com/question/22688504

#SPJ13

5 0
1 year ago
A dress listed from $119 is discounted 25%. What is the sale price of the dress including a 7 1/2 state sales tax?
Daniel [21]
If it is discounted 25%, then u r actually paying 75%

0.75(119) = 89.25 (without tax)

sales tax = 7 1/2% = 7.5% = 0.075
89.25(1.075) = $ 95.94 <===


3 0
3 years ago
Read 2 more answers
Jessica grows two types of tomato plants in her garden. For each type, she records the heights, in inches, of five plants.
Artyom0805 [142]
The answer is D 
Type 1 Type 2 plants have somewhat similar height distributions 
5 0
3 years ago
Read 2 more answers
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