Learn Important Concepts and Skills of High School Statistics

Recent questions in High school statistics

sagnuhh 2020-12-14

True? Determine whether the following statement is true: When random samples of 50 men and 50 women are obtained and we want to test the claim that men and women have different mean annual incomes, there is no need to confirm that the samples are from populations with normal distributions.

a2linetagadaW 2020-12-14

Find the expected count and the contribution to the chi-square statistic for the (Group 1, Yes) cell in the two-way table below.
$\begin{array}{ccc} Yes & No & Total \\ Group 1 & 710 & 277 & 987 \\ Group 2 & 1175 & 323 & 1498 \\ Total & 1885 & 600 & 2485 \end{array}$
Round your answer for the excepted count to one decimal place, and your answer for the contribution to the chi-square statistic to three decimal places.
Expected count=?
contribution to the chi-square statistic=?

Wribreeminsl 2020-12-09

There're 5.2 liters of blood in an average person's system. Assume, that the variable is normally distributed. The standard deviation is 0.3. What is the percentage of people with less than 5.4 liters in their system?

tabita57i 2020-12-07

Suppose you take independent random samples from populations with means $μ 1 and μ 2$ and standard deviations $σ 1 and σ 2$ . Furthermore, assume either that (i) both populations have normal distributions, or (ii) the sample sizes ( $n_{1} and n_{2}$ ) are large. If $X_{1} and X_{2}$ are the random sample means, then how does the quantity
$\frac{(\overset{―}{x_{1}} - \overset{―}{x_{2}}) - (μ_{1} - μ_{2})}{\sqrt{\frac{σ_{1}^{2}}{n_{1}} + \frac{σ_{2}^{2}}{n_{2}}}}$
Give the name of the distribution and any parameters needed to describe it.

beljuA 2020-12-07

The scatterplots below display three bivariate data sets. The correlation coefficients for these data sets are 0.03, 0.68, and 0.89. Which scatter plot corresponds to the data set with r = .03?

defazajx 2020-12-06

P({1, 2, 5, 9})
|S|=3
List all of the elements that conatain 3 elements.

Tobias Ali 2020-12-03

Which of the following binomial distributions can be well approximated by a normal distribution? A Poisson distribution? Both? Neither?
(d) $n = 1000$ , $p = .001$

Efan Halliday 2020-12-03

The two-way table shows the results from a survey of dog and cat owners about whether their pet prefers dry food or wet food.
$\begin{array}{ccc} Dry & Wet \\ Cats & 10 & 30 \\ Dogs & 20 & 20 \end{array}$
Does the two-way table show any difference in preferences between dogs and cats? Explain.

Tazmin Horton 2020-12-02

In 2014, the Pew Research Centers American Trends Panel sought to better understand what Americans know about science. It was observed that among a random selection of 3278 adults, 2065 adults could correctly interpret a scatterplot. Is this good evidence that more than 60% of Americans are able to correctly interpret scatterplots?

necessaryh 2020-12-01

True or false:
a. All normal distributions are symmetrical
b. All normal distributions have a mean of 1.0
c. All normal distributions have a standard deviation of 1.0
d. The total area under the curve of all normal distributions is equal to 1

amanf 2020-12-01

Find the corresponding z-value whose area to the left is given.
a. 0.9049
b. 0.7794
c. 0.0029

boitshupoO 2020-11-30

What does it mean for a sample to have a standard deviation of zero? Describe the scores in such a sample?

aortiH 2020-11-30

Which graphic display can be key in communicating complex study protocols?
A) CONSORT charts
B) Bubble map
C) Stem plots
D) Study outline

Lipossig 2020-11-29

Straight Lines Graph the straight lines in Exercises 1–3.
Then find the change in y for a one-unit change in x, find the point at which the line crosses the y-axis, and calculate the value of y when x 52.5.
1. $y x 5 1 2.0 0.5$
2. $y x 5 1 40 36.2$
3. $y x 5 25 6$
Scatterplots For the scatterplots in Exercises 5 describe the pattern that you see. How strong is the pattern? Do you see any outliers or clusters?

..........................

Falak Kinney 2020-11-29

State whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case.
The Salk Vaccine. In the 1940s and early 1950s, the public was greatly concerned about polio. In an attempt to prevent this disease, Jonas Salk of the University of Pittsburgh developed a polio vaccine. In a test of the vaccine’s efficacy, involving nearly 2 million grade-school children, half of the children received the Salk vaccine, the other half received a placebo, in this case an injection of salt dissolved in water. Neither the children nor the doctors performing the diagnoses knew which children belonged to which group, but an evaluation center did. The center found that the incidence of polio was far less among the children inoculated with the Salk vaccine. From that information, the researchers concluded that the vaccine would be effective in preventing polio for all U.S. school children, consequently, it was made available for general use.

coexpennan 2020-11-29

When we want to test a claim about two population means, most of the time we do not know the population standard deviations, and we assume they are not equal. When this is the case, which of the following is/are not true?
-The samples are dependent
-The two populations have to have uniform distributions
-Both samples are simple random samples
-Either the two sample sizes are large or both samples come from populations having normal distributions or both of these conditions satisfied.

Chaya Galloway 2020-11-26

2,500 people were chosen at random for the sample, and when asked which season they preferred. Their responses, along with their age group, are summarized in the two-way table below.
$\begin{array}{cccccc} Winter & Spring & Summer & Fall & Total \\ Children & 30 & 0 & 170 & 0 & 200 \\ Teens & 150 & 75 & 250 & 25 & 500 \\ Adults & 250 & 250 & 250 & 250 & 1000 \\ Seniors & 300 & 150 & 50 & 300 & 800 \\ Total & 730 & 475 & 720 & 575 & 2500 \end{array}$
Among those whose favorite season is spring, what proportion are adults?
$a) \frac{250}{1000}$
$b) \frac{250}{2500}$
$c) \frac{475}{2500}$
$d) \frac{250}{475}$
$e) \frac{225}{475}$

York 2020-11-26

For the standard normal distribution, find the following probabilities.
(с) $P r (z \leq 2.5)$

Jerold 2020-11-26

The following two-way contingency table gives the breakdown of a town's population according to party affiliation (A, B, C, or None) and opinion on a property tax issue:
Opinion
$\begin{array}{ccc} Affiliation & Favors & Opposes & Undecided \\ A & 0.12 & 0.09 & 0.07 \\ B & 0.16 & 0.12 & 0.14 \\ C & 0.04 & 0.03 & 0.06 \\ None & 0.08 & 0.06 & 0.03 \end{array}$
A person is selected at random. What is the probability that the person is affiliated with parties A or B?

Jaden Easton 2020-11-26

Find the expected count and the contribution to the chi-square statistic for the (Control, Disagree) cell in the two-way table below.
$\begin{array}{ccc} Strongly Agree & Agree & Neutral & Disagree & Strongly Disagree \\ Control & 38 & 47 & 2 & 12 & 11 \\ Treatment & 60 & 45 & 9 & 4 & 2 \end{array}$
Round your answer for the excepted count to one decimal place, and your answer for the contribution to the chi-square statistic to three decimal places.
Expected count ?
Contribution to the chi-square statistic ?

As a rule, high school statistics help is quite hard to find because once a student starts looking for statistics help, it comes up with more advanced help in this regard. Taking this problem into consideration, we have collected some helpful high school statistics questions and answers that will meet the high-school level standards. Looking into these will help you to find the most suitable solution or post your own questions based on equations, data reports, and so on. Take your time to explore available high school statistics questions as these will be mostly similar to what you may have.

High school statistics

Statistics Projects for High School Students