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Recent questions in High school statistics

Kye 2021-01-31

Find the linear regression line for a scatterplot formed by the points $(10, 261), (21, 252), (42, 209), (33, 163),$ and $(52, 98) .$ Round to the nearest tenth.

Anonym 2021-01-30

Name only one data shape which is different from symmetric and right/left skewed
Name four different graphs that show a summary of the data.

Khadija Wells 2021-01-30

Gastric freezing was once a recommended treatment for ulcers in the upper intestine. One experiment compared 82 subjects randomly assigned to gastric freezing and 78 subjects randomly assigned to receive a placebo. The two-way table shows the results of the experiment. Is there convincing evidence of an association between treatment and outcome for subjects like these?
$\begin{array}{cccc} Gastric freezing & Placebo & Total \\ Improved & 28 & 30 & 58 \\ Didn't improve & 54 & 48 & 102 \\ Total & 82 & 78 & 160 \end{array}$

tinfoQ 2021-01-28

Select all that apply. We show that our sample statistics have (at minimum) a somewhat normal distribution because
this allows us to use t and z critical values.
this allows us to use t and z tables for probabilities.
this tells us that our sampling is appropriate.
normal distributions are cool and that's all we talk about in this class.

nicekikah 2021-01-28

For the standard normal distribution, find the following probabilities.
(a) $P r (0 \leq Z \leq 2.5)$

BenoguigoliB 2021-01-28

There is a direct relationship between the chi-square and the standard normal distributions, whereby the square root of each chi-square statistic is mathematically equal to the corresponding z statistic at significance level $α$ .
1.True
2.False

Rivka Thorpe 2021-01-28

Statistics students at a state college compiled the following two-way table from a sample of randomly selected students at their college:
$\begin{array}{ccc} Play chess & Don`t play chess \\ Male students & 25 & 162 \\ Female students & 19 & 148 \end{array}$
Answer the following questions about the table. Be sure to show any calculations.
What question about the population of students at the state college would this table attempt to answer?
State $H^{0}$ and $H^{1}$ for the test related to this table.

DofotheroU 2021-01-27

Np>5 and nq>5, estimate P(at least 11) with n=13 and p = 0.6 by using the normal distributions as an approximation to the binomial distribution. if $n p < 5 or n q < 5$ then state the normal approximation is not suitable.
p (at least 11) = ?

Line 2021-01-27

One hundred adults and children were randomly selected and asked whether they spoke more than one language fluently. The data were recorded in a two-way table. Maria and Brennan each used the data to make the tables of joint relative frequencies shown below, but their results are slightly different. The difference is shaded. Can you tell by looking at the tables which of them made an error? Explain.
$\begin{array}{cc} Y e s & N o \\ Children & 0.15 & 0.25 \\ Adults & 0.1 & 0.6 \end{array}$

generals336 2021-01-22

What is the number called that determines each unique T distribution?

banganX 2021-01-22

A county is populated with 20,899,000 people, while the population is growing at a rate of 3.2% per year. What will the population be in 19 years? Round the answer to the nearest thousand.

Suman Cole 2021-01-19

The following is a two-way table showing preferences for an award (A, B, C) by gender for the students sampled in survey. Test whether the data indicate there is some association between gender and preferred award.
$\begin{array}{ccc} A & B & C & Total \\ Female & 20 & 76 & 73 & 169 \\ Male & 11 & 73 & 109 & 193 \\ Total & 31 & 149 & 182 & 360 \end{array}$
Chi-square statistic=?
p-value=?
Conclusion: (reject or do not reject $H_{0}$ )
Does the test indicate an association between gender and preferred award? (yes/no)

Suman Cole 2021-01-19

Identify the null and alternative hypothesis in the following scenario.
To determine if battery 1 lasts longer than battery 2, the mean lasting times, of the two competing batteries are compared. Twenty batteries of each type are randomly sampled and tested. Both populations have normal distributions with unknown standard deviations.
Select the correct answer below: $H_{0} : μ_{1} \geq μ_{2}, H_{a} : μ_{1} < μ_{2}$
$H_{0} : μ_{1} \leq - μ_{2}, H_{a} : μ_{1} > - μ_{2}$
$H_{0} : μ_{1} \geq - μ_{2}, H_{a} : μ_{1} < - μ_{2}$
$H_{0} : μ_{1} = μ_{2}, H_{a} : μ_{1} \neq μ_{2}$
$H_{0} : μ_{1} \leq μ_{2}, H_{a} : μ_{1} > μ_{2}$

Albarellak 2021-01-19

How may a two-way table be used to examine potential relationships between two distinct categories within the same sample group?

abondantQ 2021-01-19

To find:Whether the data provide suffcient evidence to conclude that the invervention program reduces mean heart rate of urban bus drivers in Stockholm.

sodni3 2021-01-17

Jack has collected money for a buisness start up from different sources:
1st. $56,500.
2nd. $38,000.
3rd. $128,000.
4th. $22,500.
a) Find the total amount collected.
b) Detirmine the percentage of each source's money from the total amount. Translate into degrees for a pie chart.

Lewis Harvey 2021-01-16

Find the expected count and the contribution to the chi-square statistic for the (Group 1, No) cell in the two-way table below.

$\begin{array}{ccc} Yes & No & Total \\ Group 1 & 56 & 42 & 98 \\ Group 2 & 135 & 67 & 202 \\ Group 3 & 66 & 23 & 89 \\ Total & 257 & 132 & 389 \end{array}$
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 = ?

pancha3 2021-01-15

The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke to be .30.
a) How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 2%? Use 95% confidence.
b) Assume that the study uses your sample size recommendation above and finds 520 smokers. What is the point estimate of the proportion of smokers in the population?
c) What is the 95% confidence interval for the proportion of smokers in the population?

Brittney Lord 2021-01-15

Two children own two-way radios that have a maximum range of 2 miles. One leaves a certain point at 1:00 P.M., walking due north at a rate of 4 . The other leaves the same point at 1:15 P.M., traveling due south at 6 . When will they be unable to communicate with one another?

Lennie Carroll 2021-01-13

(b) Give a brief outline describing how the normal approximation to the binomial distribution is used in the construction of confidence intervals for a proportion p.

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