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Lakshya H

Numerade Educator

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Numerade tutor for 5 years
410 Students Helped

Lakshya's Quick Ask Videos

03:32
Intro Stats / AP Statistics

Q1 On average, the number of road accidents per year in a
specific town is 325.
a)Calculate the mean and standard deviation of the number of
accidents per week.
b)What is the probability of there being less than 5 accidents in a
given week?
02:15
Intro Stats / AP Statistics

A business school placement director wants to estimate the mean
annual salaries 5 years after students graduate. A random sample of
15 such graduates found a sample mean of $42,740 and a sample
standard deviation of $4,780.
(a) Find the UCL and LCL of a 98% confidence interval for the
population mean, assuming that the population distribution is
normal.
(b) What is the LCL? (answer in two decimal places)
What is the UCL? (answer in two decimal places)
04:06
Intro Stats / AP Statistics

A very large batch component has arrived at a distributor and 10% of the components in the batch are defective but the distributor does not know the exact percentage of the defective components. He decides to randomly select 10 components and to accept the batch only if the number of defective components in the sample is at most 2.a. What is the probability that the batch will be accepted? b. What is the probability that among 10 components, 5 of them are defective? c. What is the probability that among 10 components, 3 or 4 of them are defective?
04:12
Intro Stats / AP Statistics

On a hospital staff, there are 4 dermatologists, 7 surgeons, 5 general practitioners, 3 psychiatrists, and 3 orthopedic specialists. If a doctor is selected at random, find the probability that the doctor is:
(a) A psychiatrist, surgeon, or dermatologist
(b) A general practitioner or surgeon
(c) An orthopedic specialist, a surgeon, or a dermatologist.
(d) Not a dermatologist or psychiatrist.
02:18
Intro Stats / AP Statistics

Suppose that the continuous random variable X has pdf f(x)
=x2/9 for 0 ≤ x ≤ 3. What is its cdf? What is the
expected value?
01:05
Intro Stats / AP Statistics

Consumers Energy states that the average electric bill across
the state is $67.16. You want to test the claim that the average
bill amount is greater than $67.16. The hypotheses for this
situation are Null Hypothesis: u = 67.16, Alternative Hypothesis: u
> 67.16. If the true statewide average bill is $51.28 and the
null hypothesis is not rejected, did a type I, type II, or no error
occur?
No error has occurred.
Type I Error has occurred.
Type II Error has occurred.
We do not know the p-value, so we cannot determine if an error
has occurred.
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