Roee Shalom

Rutgers, The State University of New Jersey
Researcher

Biography

Hello!
I recently graduated from community college with an applied Math and Science Associates Degree. I am continuing my studies at Rutgers University pursuing a computer science Bachelors Degree of Science.

Education

BS Computer Science
Rutgers, The State University of New Jersey

Educator Statistics

Numerade tutor for 3 years
1548 Students Helped

Topics Covered

Breaking Limits: Unlock Your Potential with Our Expert Solutions
Exploring the World of Derivatives: A Comprehensive Guide
Mastering Integration Techniques for Optimal Results
The Normal Distribution
Exploring Probability Topics: From Basics to Advanced Strategies
Unlocking Insights with Descriptive Statistics: A Comprehensive Guide
Hypothesis Testing with One Sample: A Comprehensive Guide
Maximizing Accuracy with Effective Sampling and Data Analysis
How Markets Work: Understanding the Dynamics of Supply and Demand
Balancing Markets and Welfare: Striving for Equilibrium
Understanding Continuous Random Variables: Key Concepts
Understanding the Normal Distribution: A Comprehensive Guide

Roee's Textbook Answer Videos

0:00
Seeing Through Statistics

Are null and alternative hypotheses statements about populations or samples, or does it depend on the situation?

Chapter 23: Hypothesis Testing—Examples and Case Studies
Roee Shalom
0:00
Fundamentals of Biostatistics

Studies have been undertaken to assess the relationship between abortion and the development of breast cancer. In one study among nurses (the Nurses' Health Study II), there were 16,359 abortions among 2,169,321 person-years of follow-up for women of reproductive age. (Note: 1 personyear $=1$ woman followed for 1 year.)
What is the expected number of abortions among nurses over this time period if the incidence of abortion is 25 per 1000 women per year and no woman has more than 1 abortion?

Chapter 4: Discrete Probability Distributions
Roee Shalom
0:00
Fundamentals of Futures and Options Markets

The current price of silver is $\$ 9$ per ounce. The storage costs are $\$ 0.24$ per ounce per year payable quarterly in advance. Assuming that interest rates are $10 \%$ per annum for all maturities, calculate the futures price of silver for delivery in nine months.

Chapter 5: Determination of Forward and Futures Prices
Roee Shalom
0:00
Economics

The demand and supply schedules for gum are
a. Describe the situation explain how the price a and
b. Suppose that the price pack. Describe the situation and explain how the price adjusts.
$$\begin{array}{ccc} & \begin{array}{c}\text { Quantity } \\\text { demanded }\end{array} & \begin{array}{c}\text { Quantity } \\\text { supplied }\end{array} \\\cline { 2 - 3 } \text { Price } & \text { (millions of pocks a week) } \\\hline \text { [cents per pock] } & 180 & 60 \\\hline 20 & 140 & 100 \\40 & 100 & 140 \\60 & 60 & 180\end{array}$$

Chapter 3: Demand and Supply
Roee Shalom
0:00
Statistics for Business Economics

The random variable $x$ is known to be uniformly distributed between 1.0 and 1.5
a. Show the graph of the probability density function.
b. Compute $P(x=1.25)$
c. Compute $P(1.0 \leq x \leq 1.25)$
d. Compute $P(1.20<x<1.5)$

Chapter 6: Continuous Probability Distributions
Roee Shalom
1 2 3 4

Roee's Quick Ask Videos

02:53
Intro Stats / AP Statistics

An average of 90 patrons per hour arrive at a hotel lobby
(interarrival times are exponential), waiting to check in. At
present, there are 5 clerks, and patrons are waiting in a
single
line for the first available clerk. The average time for a
clerk
to service a patron is 3 minutes (exponentially distributed).
Clerks earn $10 per hour, and the hotel assesses a waiting
time cost of $20 for each hour that a patron waits in line.
a Compute the expected cost per hour of the current
system.
b The hotel is considering replacing one clerk with an
Automatic Clerk Machine (ACM). Management estimates
that 20% of all patrons will use an ACM. An
ACM takes an average of 1 minute to service a patron.
It costs $48 per day (1 day 8 hours) to operate an
ACM. Should the hotel install the ACM? Assume that
all customers who are willing to use the ACM wait in a
single queue.

Roee Shalom
02:47
Intro Stats / AP Statistics

It has been reported by a university's president that 60% of the students are using their cell phones during class to text their peers. A professor wants to see if her students are using their cell phones less frequently than the general population. The professor surveys the students and asks them to report the number of minutes they use their cell phones during a day at the university. Open the Excel file "cell phone use" and using SPSS, conduct a t-test to test the professor's assumption that her students will use their cell phones significantly less frequently than the general population at the university (alpha = .05). Write the steps for hypothesis testing and write the conclusions in APA style. Calculate and interpret the effect size for this test.

Roee Shalom
02:31
Intro Stats / AP Statistics

Give your own example of a stochastic process that
is discrete state space and discrete time. Explain why
this process fits this category.
Given a P matrix for ergodic chain, list the steps you
would take to determine w the steady state probability of
being in any given state?

Roee Shalom
02:30
Intro Stats / AP Statistics

In a condition of an experiment, a researcher obtains the
following scores: 2, 3, 4, 5, 6, 7, 8 What is the estimated
standard deviation? (Round to the nearest hundredth
decimal place).

Roee Shalom
02:23
Physics 101 Mechanics

A coil formed by wrapping 50 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 30.0° with the direction of the field. When the magnetic field is increased uniformly from 200 μT to 600 μT in 0.400 s, an emf of magnitude 80.0 mV is induced in the coil. What is the total length of the wire in the coil?

Roee Shalom
02:51
Intro Stats / AP Statistics

The data show the bug chirps per minute at different
temperatures. Find the regression equation, letting the first
variable be the independent (x) variable. Find the best
predicted temperature for a time when a bug is chirping at the rate
of
3000
chirps per minute. Use a significance level of 0.05. What is
wrong with this predicted value?
Chirps in 1 min
1099
771
875
866
1199
778
Temperature
(°F)
83.9
70.5
72.9
71.2
88.5
67.8
What is the regression equation?
y=()+()x
(Round the x-coefficient to four decimal places as
needed. Round the constant to two decimal places
as needed.)
What is the best predicted temperature for a time when a bug is
chirping at the rate of
3000
chirps per minute?
The best predicted temperature when a bug is chirping at
3000
chirps per minute is
°F.
(Round to one decimal place as needed.)
What is wrong with this predicted value? Choose the
correct answer below.
A.
It is only an approximation. An unrounded value would be
considered accurate.
B.
The first variable should have been the dependent variable.
C.
It is unrealistically high. The value 3000 is far outside of the
range of observed values.
D.
Nothing is wrong with this value. It can be treated as an
accurate prediction.

Roee Shalom
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