In a random sample of 9 cell phones, the mean full retail price was $546.70 and the standard deviation was $195.00. further research suggests that the population mean is $428.87. does the t-value for the original sample fall between minus−t 0.99 and st 0.99?

Step-by-step explanation:

We are given the following in the question:  

Population mean, μ = $428.87

Sample mean, = $546.70

Sample size, n = 9

Sample standard deviation, s = $195.00

Formula:

Putting all the values, we have

Thus, the t-value does not lie in the interval (-0.99,0.99)

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

hope this !

step-by-step explanation:

d = distance between moon and sun, which in this problem is the hypotenuse of a right triangle.  

the distance y is the side opposite to angle x in the right triangle.   use the definition of the sine function from basic trigonometry.

sin(x) = y/d ⇒

d = y/sin(x)