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Recent questions in High school statistics

ossidianaZ 2021-03-08

Using data from the 2000 census, a random sample of 348 U.S. residents aged 18 and older was selected. The two-way table summarizes the relationship between marital status and housing status for these residents. $\begin{array}{lccc} M a r r i e d & N o t m a r r i e d & T o t a l \\ O w n & 172 & 82 & 254 \\ R e n t & 40 & 54 & 94 \\ T o t a l & 212 & 136 & 348 \end{array}$

remolatg 2021-03-07

We have a set of n-elements (A), and a set of m-elements (B).
$n \geq 0$
$m \geq 0$
Find how many relations there're from A to B.

texelaare 2021-03-06

A normal distribution has $μ = 30$ and $σ = 5$ .
(c)Find the raw score corresponding to $z = - 2$ .

sagnuhh 2021-03-06

Make a scatterplot for the data.
Height and Weight of Females
$\begin{array}{cc} Height (in.): & 58 & 60 & 62 & 64 & 65 & 66 & 68 & 70 & 72 \\ Weight (lb): & 115 & 120 & 125 & 133 & 136 & 115 & 146 & 153 & 159 \end{array}$

Amari Flowers 2021-03-05

1950 randomly selected adults were asked if they think they are financially better off than their parents. The following table gives the two-way classification of the responses based on the education levels of the persons included in the survey and whether they are financially better off, the same as, or worse off than their parents
$\begin{array}{ccc} Less Than High School & High School & More Than High School \\ Better off & 140 & 440 & 430 \\ Same as & 60 & 230 & 110 \\ Worse off & 180 & 280 & 80 \end{array}$
Suppose one adult is selected at random from these 1950 adults. Find the following probablity.
Round your answer to three decimal places.
$P (more than high school or worse off) = ?$

babeeb0oL 2021-03-05

Match the values of r with the accompanying scatterplots 0.723,-0.353,0.353,0.998 and -0.998
scatterplots 1,2,3,4,5

Clifland 2021-03-04

How are the smoking habits of students related to their parents

Dolly Robinson 2021-03-04

Sketch a scatterplot where the association is linear, but the correlation is close to [r = 0].

Annette Arroyo 2021-03-04

Consider the marks of all 1st-year students on a statistics test. If the marks have a normal distribution with a mean of 72 and a standard deviation of 9, then the probability that a random sample of 10 students from this group have a sample mean between 71 and 73 is?

Armorikam 2021-03-02

In the 1970s a study was conducted in Philadelphia in which 500 cases were randomly assigned to treatments for the common cold: 250 subjects received the medication and 250 received a placebo. A total of 383 patients improved within 24 hours. Of those who received the medication 241 improved within 24 hours and of those who received the placebo 142 improved within 24 hours. A test of significance was conducted on the following hypotheses.
$H_{o}$ : The rates for the two treatments are equal.
$H_{a}$ : The treatment of medication has a higher improvement rate.
This test resulted in a p-value of 0.0761.
a.) Interpret what this p-value measures in the context of this study.
b.) Based on this p-value and study design, what conclusion should be drawn in the context of this study? Use a significance level of $α = 0.05$ .
c.) Based on your conclusion in part (b), which type of error, Type I or Type II, could have been made? What is one potential consequence of this error?

vestirme4 2021-03-02

When performing a $χ^{2}$ test of independent in a contingency table with r rows and c columns, determine the upper-tail critical value of the test statistic in each of the following circumstances:
1. α=0.05, r=4 rows, c=5 columns
2. α=0.01, r=4 rows, c=5 columns
3. α=0.01, r=4 rows, c=6 columns
4. α=0.01, r=3 rows, c=6 columns
5. α=0.01, r=6 rows, c=3 columns

ddaeeric 2021-03-02

$(μ 1 - μ 2)$ For two normal distributions
Obtain the appropriate point estimator

Nannie Mack 2021-03-02

The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke (CDC website, December 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 0.30. a. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 0.02? Use 95% confidence.

emancipezN 2021-03-02

Unusual points Each of the four scatterplots that follow shows a cluster of points and one “stray” point. For each, answer these questions:
1) In what way is the point unusual? Does it have high leverage, a large residual, or both?
2) Do you think that point is an influential point?
3) If that point were removed, would the correlation be- come stronger or weaker? Explain.
4) If that point were removed, would the slope of the re- gression line increase or decrease? Explain

Burhan Hopper 2021-03-02

In a General Social Survey of Americans in 1991, two variables, gender and finding life exciting or dull, were measured on 980 individuals. The two-way table below summarizes the results.
Let A = randomly chosen person is female
Let B = randomly chosen person finds life exciting
(a) Find P(A | B)
(b) Are the events A & B independent?
$\begin{array}{ccc} Original Counts & Exciting & Routine & Dull & Total \\ Male & 213 & 200 & 12 & 425 \\ Female & 221 & 305 & 29 & 555 \\ Female & 434 & 505 & 41 & 980 \end{array}$

Daniaal Sanchez 2021-03-01

A yoga class consists of 90 males and 110 females. What is the ratio of male to female students?

Globokim8 2021-02-27

True or False: only the sums of normal distributions are also normal distributions.

zi2lalZ 2021-02-26

Consider two normal distributions, one with mean-4 and standard deviation 3, and the other with mean 6 and standard deviation 3. Answer true or false to each statement and explain your answers.
a. The two normal distributions have the same spread.
b. The two normal distributions are centered at the same place.

nitraiddQ 2021-02-26

Give relations mentioned in the given scatterplots A & B

Chardonnay Felix 2021-02-25

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 $n = 25$ and $p = 0.15$ . Can we safely approximate the $\hat{p}$ distribution by a normal distribution? Why or why not?

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