Please help me I have this same class

A professor of cognitive psychology is interested in the percent accuracy on this memory encoding task among college students. S

andrew11 [14]

Answer:

a) Expected value of the mean = 0.793 percent

b) Standard error = 0.019 percent.

Step-by-step explanation:

Given

mean = μ = 0.793 percent

Standard deviation = σ = 0.114 percent

a) The sample mean is related to the population mean through

μₓ = μ = 0.793 percent

Hence, the expected value of the sample mean = 0.793 percent.

b) The standard error is given as

Standard error = σ/√n

where n = sample size = 36

Standard error = (0.114/√36)

Standard Error = 0.019 percent.

Hope this Helps!!!

8 0

4 years ago

Which of the quadratic functions has the narrowest graph?

charle [14.2K]

Answer:

$y=\frac{1}{8}x^2$

Step-by-step explanation:

A quadratic function has the formula ax² + bx + c

To determine if a graph will be narrow or wide, the leading coefficient, a, will be the factor that determines this
The greater the coefficient, the narrower the parabola
The lesser the coefficient, the wider the parabola

Here all of the functions are in the form ax²

In $y=\frac{1}{8}x^{2}$ , our "a" term is $\frac{1}{8}$
In y = -2x², our "a" term is -2
In y = -3x², our "a" term is -3
In $y=\frac{1}{3}x^{2}$ , our "a" term is $\frac{1}{3}$

We can eliminate the two functions with the negative coefficients because they are much smaller than the two functions with the fractions as coefficients, and will therefore open much wider.

We can now compare the two remaining functions, $y=\frac{1}{8}x^2$ and $y=\frac{1}{3}x^2$

Giving the two fractions common denominators would turn them into $y = \frac{3}{24}x^2$ and $y=\frac{8}{24} x^2$
The equation with the larger fraction will be the parabola that is the narrowest. In this case, it is the $y=\frac{8}{24} x^2$ .
Therefore, $y=\frac{1}{8}x^2$ will have the narrowest graph

7 0

3 years ago

Which formula gives the coordinates of the midpoint of the segment connecting points (a, b) and (c, d)?

Vesna [10]

$( \frac{x1 + x2}{2} ) \: \: ( \frac{y1 + y2}{2} )$
You don't multiply both of them, it's a coordinate function. There's suppose to be a comma in between

4 0

4 years ago

Read 2 more answers

a new energy drink advertise 182 calories for 6 ounces how many calories are in 21 ounces of the drink? There are ____ calories

liberstina [14]

I think it should be 637

4 0

3 years ago

Read 2 more answers

A certain rectangular prism has a height of 6 m, a length of 5 m, and a width of 4 m. Give the dimensions of a second rectangula

trasher [3.6K]

Answer: