Practice Math Statistics Problems and Master the Concepts

Give full and correct answer for this questions 1) The standard erroe of the population mean can be estimated by 2)For an experiment comparing two treatment conditions, an independent-measures design would obtain ? score(s) for each subject and a repeated-measures design would obtains ? score(s) for each subject. 3) Which of the following describes an independent-measures research study?

sanuluy 2020-11-01

Find the critical points of the following functions on the given intervals. Identify the absolute maximum and absolute minimum values (if they exist). $f (x) = x^{3} - 6 x^{2} on [- 1, 5]$

slaggingV 2020-11-01

Solve the following problems applying Polya’s Four-Step Problem-Solving strategy.
If six people greet each other at a meeting by shaking hands with one another, how many handshakes take place?

Reggie 2020-11-01

The random variable X follows a normal distribution $? (20, 102)$ .
Find $F \in d P (? > 30)$ ,

vazelinahS 2020-10-31

A sample of 2861 Bloomberg Businessweek subscribers in North America were used to gather data for this study. Fifty-nine percent of the respondents indicated an annual income of $$ 75, 000$ or more, and 50% reported having an American Express credit card.
a. What is the population of interest in this study?
b. Is annual income a categorical or quantitative variable?
c. Is ownership of an American Express card a categorical or quantitative variable?

Cheyanne Leigh 2020-10-31

How do you find the number k by looking at the graph of
$y = k + A \sin (B x + C) ?$

OlmekinjP 2020-10-28

Give a full and correct answer for thew given queston In a causal-analysis with group 1 and group 2, (a) we want to compare the population proportion of who will probably be in group 1 with the population proportion of those who will probably be in group 2. (b) we want to compare the population proportion when everyone is put into group 1 with the population proportion when everyone is put into group 2. (c) we want to compare the population proportion of those are in group 1 with the population proportion of those who are group 2. (d) we want to compare the population proportion of who might be in group 1 with the population proportion of those who might be in group 2.

Chesley 2020-10-28

Explain the statement ‘The main priority with sampling distributions is to get across the idea that estimates and other statistics change every time we do a new study’.

arenceabigns 2020-10-28

There is a suspicion that time depends on distance. Make a scatterplot of time against distance, using separate symbols for each hand.

Isa Trevino 2020-10-28

A population of values has a normal distribution with $μ = 200$ and $σ = 31.9$ . You intend to draw a random sample of size $n = 11$ .
Find the probability that a single randomly selected value is less than 226.9.
$P (X < 226.9) =$ ?
Write your answers as numbers accurate to 4 decimal places.

Anonym 2020-10-28

A distribution of values is normal with a mean of 166.1 and a standard deviation of 73.5.
Find the probability that a randomly selected value is between 151.4 and 283.7.
$P (151.4 < X < 283.7) =$ Incorrect
Write your answers as numbers accurate to 4 decimal places.

Wierzycaz 2020-10-28

A manager at ACME Equipment Sale and Rental wondered how offering a free two-year service warranty on its tractors might influence sales. For the next 500 customers who expressed interest in buying a tractor, 250 were randomly offered a warranty, and the rest did not receive. Ninety-three of those offering a warranty, and fifty-four of those not offering a warranty ended up buying a tractor.
a. Construct a $95 %$ confidence interval for the difference between the proportions of customers purchasing tractors with and without warranties. Be sure to check all necessary assumptions and interpret the interval.
b. Test the hypothesis that offering the warranty increases the proportion of customers who eventually purchase a tractor. Be sure to check all necessary assumptions, state the null and alternative hypotheses, obtain the p-value, and state your conclusion. Should a manager offer a warranty based on this test?

Dolly Robinson 2020-10-28

Two owners of a cattle ranch, Jo and Val, want to find the average weight for the ranch’s 200 cows. Instead of weighing all of the cows:
Jo weighs 25 cows and gets an average weight of 1,350 pounds (stdev 50)
Val weighs 100 cows and gets an average weight of 1,420 pounds (stdev 50)
What is Jo’s margin of error, rounded to the nearest whole number?

CheemnCatelvew 2020-10-28

Find the mean for the data.
The data represents the costs of nine compact refrigerators rated very good or excellent by Consumer Reports on their website.

zi2lalZ 2020-10-27

Round each z-score to the nearest hundredth.
A data set has a mean of
$x = 6.8$
and a standard deviation of 2.5. Find the z-score.
$x = 5.0$

tabita57i 2020-10-27

Sharing music online (5.2, 5.3). A sample survey reports that 29% of Internet users download music files online, 21% share music files from their computers, and 12% both download and share music. Make a two-way table that displays this information.

Dolly Robinson 2020-10-27

A population of values has a normal distribution with $μ = 192.3$ and $σ = 66.5$ . You intend to draw a random sample of size $n = 15$ .
Find the probability that a sample of size $n = 15$ is randomly selected with a mean less than 185.4.
$P (M < 185.4) =$ ?
Write your answers as numbers accurate to 4 decimal places.

emancipezN 2020-10-27

In 1997. Superman's cape from the 1978 movie Superman was sold at an auction. The winning bid was $ 17,000. Write and graph an inequality that represents the amounts all the losing bids.

vazelinahS 2020-10-27

Solvin system of equations graphically

aortiH 2020-10-27

What is the best measure of central tendency for 2 nominal level variables and why?

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