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Recent questions in High school statistics

Jaya Legge 2021-02-25

5 buildings

ediculeN 2021-02-25

List all of the elements of ${I, J, K} \times {Q, R} .$

Anonym 2021-02-25

a. Make a scatterplot for the data in the table below.
Height and Weight of Football Players
$\begin{array}{cc} Height (in.): & 77 & 75 & 76 & 70 & 70 & 73 & 74 & 74 & 73 \\ Weight (lb): & 230 & 220 & 212 & 190 & 201 & 245 & 218 & 260 & 196 \end{array}$

b. Which display - the table or the scatter plot - do you think is a more appropriate display of the data? Explain your reasoning.

Globokim8 2021-02-25

Explain why t distributions tend to be flatter and more spread out than the normal distribution.

Sinead Mcgee 2021-02-25

Use a scatterplot and the linear correlation coefficient r to determinewhether there is a correlation between the two variables.
[x 1 2 2 5 6 y 2 5 4 15 15]

vestirme4 2021-02-24

How to prove that a normally distributed assumption was fulfilled for the Two-Proportional z-test?
Select all relevant assumptions.
Residual graphs do not have a pattern
Scattered plots are linear
Scattered plots do not have a pattern
Normal sample distribution: npge5&n(1-p)ge5
Bell-shaped histograms
Histograms are uniform
Residual graphs are linear
Residual graphs are linear box plots have less than two outliers
Normal quantile plots do not have a pattern
Normal sample distribution: n,p,ge5,n,(1-p)ge5,n_2p_2ge5&91-p_2)ge5
Normal sample distribution: n'sge30 or populations usually are distributed

Burhan Hopper 2021-02-24

Consider the rates of children (under 18 years of age) living in New York with grandparents as their primary caretakers. A sample of 13 New York counties yielded the following percentages of children under 18 living with grandparents.
5.9, 4.0, 5.7, 5.1, 4.1, 4.4, 6.5, 4.4, 5.8, 5.1, 6.1, 4.5, 4.9
a) Obtain and interpret the quartiles.
b) Determine and interpret the interquartile range.
c) Find and interpret the five-number summary

coexpennan 2021-02-24

A correlational study is designed to?
a) assess the association between two interval measures.
b) assess the association between two categorical variables
c) compare the means of three or more groups
d) manipulate the independent variables

Nann 2021-02-24

A study of young children was designed to increase their intake of whole-grain, rather than regular-grain, snacks. At the end of the study, the 79 children who participated in the study were presented with a choice between a regular-grain snack and a whole-grain alternative. The whole-grain alternative was chosen by 55 children. You want to examine the possibility that the children are equally likely to choose each type of snack.
$H_{0} : p = 0.5$
$H_{a} : p \neq 0.5$
Perform the significance test. (Use $α = 0.01$ . Round your test statistic to two decimal places and your P-value to four decimal places.)

Haven 2021-02-23

In the middle of the design, she decided to add the following line segment. How would she name this line segment?
_ or _

Jaden Easton 2021-02-23

A set of test papers was machine scored. Later it was discovered that two points should be added to each score. Student A said, "The mean score should also be increased by two points." Student B added, "The standard deviation should also be increased by two points." Who is right? Justify your answer.

Brittney Lord 2021-02-23

Give the degrees of freedom for the chi-square test based on the two-way table.
$\begin{array}{ccc} Yes & No & Total \\ Group 1 & 56 & 44 & 100 \\ Group 2 & 132 & 68 & 200 \\ Group 3 & 72 & 28 & 100 \\ Total & 260 & 140 & 400 \end{array}$
Degrees of freedom=?

allhvasstH 2021-02-22

Why do two normal distributions that have equal standard deviations have the same shape?

Jaya Legge 2021-02-22

The normal distribution is really a family of distributions. Is the standard normal distribution also a family of distributions?Explain.

remolatg 2021-02-21

The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke $⟨ C D C w e b s i t e, D e c e m b e r 14, 2014 ⟩$ . Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of 30.

a.) How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02(to the nearest whole number)? Use 95% confidence.

b.) Assume that the study uses your sample size recommendation in part(a) and finds 520 smokers. What is the point estimate of the proportion of smokers in the population(to 4 decimals)?

c.) What is the 95% confidence interval for the proportion of smokers in the population (to 4 decimals)?

Cem Hayes 2021-02-21

Find the mean of standard normal distribution.
Find the standard deviation of standard normal distribution.

pancha3 2021-02-19

Make a scatterplot for each set of data. Tell whether the data show a linear association or a nonlinear association.
$(1, 2), (7, 9.5), (4, 7), (2, 4.2), (6, 8.25), (3, 5.8), (5, 8), (8, 10), (0, 0)$

Sinead Mcgee 2021-02-19

Is wrapping a banana in plastic wrap and leaving the other bananas alone to see which one rots faster and experimental study design or and observational study design?

permaneceerc 2021-02-18

To explain: whether the given study on male health professional is an observational study with a cohort design, an observational study with case-control design or an experiment

ankarskogC 2021-02-16

Basic Computation: hat p Distribution Suppose we have a binomial experiment in which success is defined to be a particular quality or attribute that interests us.
(b) Suppose $n = 20$ and $p = 0.23$ . Can we safely approximate the $\hat{p}$ distribution by a normal distribution? Why or why not?

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