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Question 43014

posted 11 months ago

Your professor gives you a population of freshmen students at UCLA, and asks you to compute a 99% pivotal Cl for their mean high school GPAS. What would you do?
a. I would ask a classmate and do whatever they tell me to
b. Cls make sense when we have samples and not the whole population. This is an absurd task and I would respectfully let my professor know that this is not reasonable
c. I would respectfully do what my professor wants because want an A in this class
d. I would use the bootstrap resampling with replacement of the population 10,000 times and compute a pivotal 99% Cl from the histogram of such mean GPAS

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Question 43035

posted 11 months ago

Which of the following is/are synonymous with P(+ | COVID-19)?
O d. 1- Specificity
O a.Sensitivity
b. Prevalence
Oc.Specificity

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Question 43022

posted 11 months ago

The ornithologist finds that each species differs in the mean number of eggs laid, but fails to find any difference by habitat. Which plot best illustrates this finding?
O a. Plot i
c. Plot iii
Plot ii
O d. Plot iv

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Question 43031

posted 11 months ago

Which of the following is/are true statement(s) about the power of a study? Select all that apply.Note: Wrong selection results in points deduction on this question. Please choose wisely
O d. Given an effect size, increasing the variability of samples increases power
O a.Given an effect size, increasing the sample size increases power
O b. Given an effect size, increasing alpha cutoff increases power
c. Power is invariant to the magnitude of effect size for a given alpha cutoff and sample size

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Question 43036

posted 11 months ago

Which of the following is/are synonymous with P(COVID-19)?
O a. PrevalenceO b. Specificityc. 1- SpecificityO d. Sensitivity

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Question 43038

posted 11 months ago

Drag and drop the various terms into the correct boxes to compute the posterior probability of you having the COVID-19.

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Question 43013

posted 11 months ago

Which of the following is correct about a bootstrap confidence interval? Select all that apply.
O a. A 95% confidence interval obtained using the bootstrap approach can be interpreted as "we can be 95% sure that the true measure is in the interval provided"
O b. A bootstrap pivotal confidence interval assumes that the observed sample measure is a pivot such that the variability in sample measures around the true population measure is the same as the variability of measures from the bootstrap resamples around the observed measure
O c.A confidence interval provides an estimate of precision of an effect size
O d. A confidence interval provides an estimate of uncertainty in the sample measure

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Question 43016

posted 11 months ago

What type of box model is appropriate for NHST for the two-group data presented below and why?
а.Ranked big-box because the two distributions are unknown
O b. Re-centered two-box because the two groups might come from two different populations
O c. Ranked big-box because there is such a small number of samples that it is better to combine them to make a larger list
O d. Such data should be analyzed using traditional methods such as the t-test

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Question 43019

posted 11 months ago

UCLA is interested in the effects of living at home on student performance. After collecting data, researchers tested whether having a pet (yes or no) and having siblings at home (none,1, or >1) affected time spent on completing an assignment. Which of the following NHSTS would be most appropriate?
a. One-way ANOVA
O bComparing two groups (independent samples)
O d. Repeated measures ANOVA
O c. Two-way ANOVA
O f. Correlation and regression
Comparing two groups (paired samples)
An ornithologist measures the number of eggs laid per year by two species of thrush in two different habitats. Plotting the data, they create one of the four plots below, where the habitat is on the x-axis (habitat 1 vs habitat 2) and the colors (red vs blue) represent the two species.

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Question 43017

posted 11 months ago

What type of box model is suitable for computing the bootstrap confidence interval for paired datasets?
O b. One-box paired deltas with replacement
O d. One-box paired deltas without replacement
c. Two-box resampling with replacement
O a.Re-centered two-box with replacement
O e. Big-box resampling with replacement

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