Practice Math Statistics Problems and Master the Concepts

When should we use pooled, non-pooled or paired output to compare the means of two populations. you need to be specific and give the correct answer.

DofotheroU 2020-11-24

According to the article “Modeling and Predicting the Effects of Submerged Arc Weldment Process Parameters on Weldment Characteristics and Shape Profiles” (J. of Engr. Manuf., 2012: 1230–1240), the submerged arc welding (SAW) process is commonly used for joining thick plates and pipes. The heat affected zone (HAZ), a band created within the base metal during welding, was of particular interest to the investigators. Here are observations on depth (mm) of the HAZ both when the current setting was high and when it was lower. $\begin{matrix} N o n - h i g h & 1.04 & 1.15 & 1.23 & 1.69 & 1.92 & 1.98 & 2.36 & 2.49 & 2.72 & 1.37 & 1.43 & 1.57 & 1.71 & 1.94 & 2.06 & 2.55 & 2.64 & 2.82 \\ H i g h & 1.55 & 2.02 & 2.02 & 2.05 & 2.35 & 2.57 & 2.93 & 2.94 & 2.97 \end{matrix}$ c. Does it appear that true average HAZ depth is larger for the higher current condition than for the lower condition? Carry out a test of appropriate hypotheses using a significance level of .01.

jernplate8 2020-11-23

Statistical Literacy When using the F distribution to test variances from two populations, should the random variables from each population be independent or dependent?

Dolly Robinson 2020-11-23

Find the number of employees earn that are more than mean wage.

ka1leE 2020-11-23

Describe in words the region of $R R^{3}$ represented by the equation or inequality.
$z \geq - 1$

Lennie Carroll 2020-11-23

Are all continuous random variable necessarily infinite? Explain.

Globokim8 2020-11-23

If you have been asked to sample 60 people from a chosen population for an observational study. You need to ask a question that separates the sample into two groups, so that you can compare results of another question across the two groups. Therefore, your survey will only be two questions: two numerical data questions or one numerical and one categorical question.

Bergen 2020-11-22

Time and Work: Techniques and examples with solutionsToday I'm going to discuss a very important topic i.e. Time and Work of quantitative aptitude. In almost every exam at least 2-3 question are asked every time. In this chapter, I will tell you about a definite relationship between Time and work and easy method to solve the problems.

Chardonnay Felix 2020-11-22

List the assumptions necessary for each of the following inferential techniques: a. Large-sample inferences about the difference $(μ_{1} - μ_{2})$ between population means using a two-sample z-statistic b. Small-sample inferences about $(μ_{1} - μ_{2})$ using an independent samples design and a two-sample t-statistic c. Small-sample inferences about $(μ_{1} - μ_{2})$ using a paired difference design and a single-sample t-statistic to analyze the differences d. Large-sample inferences about the differences $(μ_{1} - μ_{2})$ between binomial proportions using a two sample z-statistic e. Inferences about the ratio $\frac{σ_{1}^{2}}{σ_{2}^{2}}$ of two population variances using an F-test.

cistG 2020-11-22

In a survey of 2566 adults in a recent year, 1420 say they have made a New Years

Amari Flowers 2020-11-22

What would be an example of an exposure ratio threshold?

nitraiddQ 2020-11-22

Independent random variables $X_{1} and X_{2}$ are combined according to the formula $L = 3 \cdot X_{1} + 2 \cdot X_{2}$ .
If $X_{1} and X_{2}$ both have a variance of 2.0, what is the variance of L?

Ava-May Nelson 2020-11-22

Multiple answers may be possible (partial credit added for correct answers, partial credit deducted for incorrect answers. You can't get a negative overall score for this question):
Which of the following are similarities of t-tests and ANOVA?

e1s2kat26 2020-11-20

The article “Modeling Sediment and Water Column Interactions for Hydrophobic Pollutants” (Water Research, 1984: 1169-1174) assumes a uniform distribution over the interval (7.5, 20) as a model for depth (cm) of the bioturbation layer in sediment in a certain region. a. What are the average and spread of depth? b. What is the cdf of depth? c. What is the probability that observed depth is at most 10? Between 10 and 15? d. What is the probability that the observed depth is within 1 standard deviation of the mean value? Within 2 standard deviations?

Cabiolab 2020-11-20

Solve the general initial value problem modeling the LR circuit, $\frac{d l}{d t} + R I = E, I (0) = I_{0}$ , where E is a constant source of emf.

Rui Baldwin 2020-11-20

Response rates to Web surveys are typically low, partially due to users starting but not finishing the survey. The factors that influence response rates were investigated in Survey Methodology (Dec. 2013). In a designed study, Web users were directed to participate in one of several surveys with different formats. For example, one format utilized a welcome screen witb a white background, and another format utilized a welcome screen with a red background. The "break-off rates," i.e., the proportion of sampled users who break off the survey before completing all questions, for the two formats are provided in the table.

$\begin{array}{cc} White Welcome Screen & Red Welcome Screen \\ Number of Web users & 190 & 183 \\ Number who break off survey & 49 & 37 \\ Break-off rate & 0.258 & 0.202 \end{array}$

a) Verify the values of the break-off rates shown in the table.

b) The researchers theorize that the true break-off rate for Web users of the red welcome screen will be lower than the corresponding break-off Tate for users of the white welcome screen. Give the null and alternative hypotbesis for testing this theory.

c) Conduct the test, part b, at $α = 0.10 .$ What do you conclude?

Chardonnay Felix 2020-11-17

The tallest person who ever lived was approximately 8 feet 11 inches tall.
a) Write an inequality that represents the heights of every other person who has ever lived.
b) Is 9 feet a solution of the inequality? Explain

necessaryh 2020-11-17

If you have $λ = 4.2$ , what is the probability that $P (x < 2)$ ?

glamrockqueen7 2020-11-16

In a study, you ask the subjects their gender. Is this data qualitative or quantitative?

remolatg 2020-11-16

A newsgroup is interested in constructing a $90 %$ confidence interval for the proportion of all Americans who are in favor of a new Green initiative. Of the 555 randomly selected Americans surveyed, 437 were in favor of the initiative. Round answers to 4 decimal places where possible.
a)
With $90 %$ confidence the proportion of all Americans who favor the new Green initiative is between and .
b)
If many groups of 555 randomly selected Americans were surveyed, then a different confidence interval would be produced from each group.
About percent of these confidence intervals will contain the true population proportion of Americans who favor the Green initiative and about percent will not contain the true population proportion.

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Improve Your Understanding of College Level Statistics Problems