189 Answered Questions for the topic biostatistics

Biostatistics Statistics

03/03/20

Uniformly Minimum-Variance Unbiased Estimator
1. Let X1, . . . , Xn ∼ iid Gamma(α, θ) with α known. (a) Find the uniformly minimum-variance unbiased estimator (UMVUE) for θ. (b) Determine if the UMVUE is efficient. (c) Determine if the UMVUE... more
Follows • 1
Expert Answers •1
Biostatistics

02/24/20

Normal Distribution

the common fruit fly drosophila melanogaster Is the most studied organism in genetic research because it is so small easy to grow and reproduce is rapidly the length of the thorax with the wings... more
Follows • 0
Expert Answers •1

01/18/20

Can someone help me please?
Question: Use a suitable diagram and explain the role of glutamate and AMPA/NMDA receptor interaction in the promotion of pyramidal cell excitability, accompanied by spine formation, in the... more
Follows • 2
Expert Answers •1
Biostatistics Statistics

01/08/20

I have a z values statistics question.
A population is normally distributed with µ=36 and δ=10 What is the probability of randomly selecting a value that is greater than 45?I get 18,41%, but on my lecture slides the answer is : Area... more
Follows • 1
Expert Answers •1
Biostatistics Statistics

11/09/19

p values differing amongst two groups in comparison
this is a board exam practice question, so I apologize in advance for leaving out all the details. I don't even know if this is a legitimate study.this was a study based on serum glucose levels... more
Follows • 2
Expert Answers •1
Biostatistics

11/04/19

Normal distribution and Probability
Say we have GRE scores are normally distributed with mean 500 and standard deviation 100. Find the probability that a randomly selected GRE score is greater than 620. We want to know what’s the... more
Follows • 1
Expert Answers •1
Biostatistics

09/17/19

Statistics Problem about probability
We have an urn with 1 red ball and 9 yellow balls. We will sample 3 balls form the urn with replacement. What is the probability that we will obtain at least one yellow ball?
Follows • 1
Expert Answers •1
Biostatistics Statistics

07/20/19

How to analyze changes over time statistically
I have narcotic prescription rates for each states for the last 10 years. I want to assess changes over time, but am unsure how to approach the data. I want to know what the general trend is, then... more
Follows • 2
Expert Answers •1
Biostatistics

07/12/19

Why is P-value < 5x10^-8 chosen as a threshold to reach genome-wide significance?
Follows • 1
Expert Answers •1
Biostatistics

07/12/19

Why a higher variability is usually expected when the mean increases?
Follows • 2
Expert Answers •1
Biostatistics Math Statistics Mathematics

06/23/19

PLEASE HELP ... i drew a box plot for the distribution 85,85,90,90,90,110,110,110,125 and it looked like a solid box because my median was same as Q1. Is it ok for the median to be the same as Q1??
median =90 Q1 =90 ⁄\ / / Lv / Q3 Lv •—————l‾‾‾‾‾‾‾‾‾‾‾‾‾¯¯¯¯¯¯l———————————————• ... more
Follows • 1
Expert Answers •1
Biostatistics

06/10/19

How do you conduct a study on humans to determine whether a trait is brought about by environmental or biological/hereditary mechanisms?
Follows • 2
Expert Answers •1
Biostatistics

06/09/19

How do I calculate the abundance of a species?
Follows • 1
Expert Answers •1
Biostatistics

06/07/19

What is an "at home" genetic data analysis project?
Follows • 1
Expert Answers •1
Biostatistics

06/03/19

In conducting analyses between pairwise comparisons of multiple variables in clinical trials, should clinical researchers use a p-value that is more conservative than 0.05?
Follows • 1
Expert Answers •1
Biostatistics

06/02/19

If the one who designed a questionnaire also belongs to the target group being studied, can their responses be included for analysis?
Follows • 1
Expert Answers •1
Biostatistics

05/25/19

Medical Research: What is the advantage of using a competing risk model as opposed to a standard Cox regression?
Follows • 1
Expert Answers •1
Biostatistics

05/24/19

If the ratio of (A+G/T+C) in one strand of DNA is 0.70, what is the same ratio in complimentary strand?
Follows • 1
Expert Answers •1
Biostatistics

05/03/19

What is the central limit theorem in biostatistics?
Follows • 1
Expert Answers •1
Biostatistics

04/23/19

Statistics experts, what is the best trick or little "story" for remembering the definitions of Type 1 errors and Type 2 errors?
Follows • 1
Expert Answers •1
Biostatistics

04/19/19

can this be found? or is there not enough information?

Let X be a random variable that represents the number of accidents at an intersection and assume X has a Poisson distribution within mean of 3.8 accidents per month what is the mean number of... more
Follows • 1
Expert Answers •1
Biostatistics

04/19/19

what is the formula for the false positive and how do i calculate the predictive value positive?
Neuroblastoma is a rare serious but treatable disease. The prevalence of this disease is 6.3%. Study of the screening test for neuroblastoma the VMA test a urine test gave the following... more
Follows • 1
Expert Answers •1
Biostatistics

04/19/19

tried this problem but im stuck and done know what im doing wrong please help

The time it takes broken arms of adults to heal is normally distributed with a mean of 53.7 days in a standard deviation of 5.2 days. Answer the following questions based on this... more
Follows • 1
Expert Answers •1
Biostatistics

04/19/19

not sure how to formulate this

In the US the percentage of adults who have had an appendectomy is 28%. A simple random sample of 42 adults and the US is taken. Calculate the probability of the proportion of adults who have had... more
Follows • 1
Expert Answers •1
Biostatistics Math Statistics Mathematics

03/30/19

Binomial Probability Question
In 2009, a study from a consumer research company reported that 54% of teenagers sent a text message on their cell phone during the past 30 days. A sample of 15 teenagers is studied. Round the... more
Follows • 1
Expert Answers •1

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.