Harper MTH165 Homework Section 8.3 Latest 2020 MAY

MTH165 ELEMENTARY STATISTICS

Homework Section 8.3

In this section you learned how to compute a confidence interval for the mean using T-Test

                In this section you are dealing with ____one sample interval for the mean___________________ data.

                The symbol for the parameter in this section is _ __.

                The symbol for the point estimate for that parameter is  ? __.

                What input screen do you use for the interval estimate? T Interval ___________________________________

                What graph do we look at to see if there are any outliers? __ plots____________________________

                If n is at least 30, does the population have to be normally distributed? __ ____

Fill in the following as you work through your given problems in MyOpenMath

1.            individual object:  _ _____________________________________________

                Variable:

What type of variable is this?  quantitative-discrete                         quantitative-continuous                               qualitative

P:

μ

A:  (Reference the graphs you checked in StatCrunch for this data)

n≥30 or normal population

σ is unknown

no outliers in the data

N:

The conditions are met to use a T interval

I:

X ? = 91.699 percent

μ = (89.252 percent, 94.146 percent)

C:

We are 97% confident that the mean percentage of woman receiving prenatal care of all countries in 2009

is between 89.252 percent and 94.146 percent.

Rewrite the interval above as point estimate ± margin of error:  _________________________

2.            individual object:  __elderly people____________________________________________

                Variable: _the mean forward sway__________________________________

                What type of variable is this?  quantitative-discrete                         quantitative-continuous                               qualitative

                P:

μ

The mean forward sway of all elderly people

A:  (Reference the graphs you checked using StatCrunch for this data)

Since quantitative information was collected from each object, what conditions do we need to check?  Check all that apply.

n≥30 or normal population

σ is unknown

no outliers in the data

N:

The conditions are met to use a T interval

I:

X ? = 27.5 mm

μ = (22.7 mm, 32.4 mm)

C:

We are 99% confident that the mean forward sway of all elderly people is between 22.7 mm and 32.4 mm

Rewrite the interval above as point estimate ± margin of error:  27.5 ± ___________________________