Question
In: Statistics and Probability
Students who took STAT 1001 can be divided into two groups; those who attended class regularly...
Students who took STAT 1001 can be divided into two groups; those who attended class regularly and benefited from the awesome lecture and those who did not attend and missed out on great information. Two independent random samples of 20 students were taken from each group (i.e. n1 = n2 = 20), and their final exam scores were registered. The average grades for those who attended regularly and those who did not were 71.5% and 61.5%, respectively. Let’s assume that the population St. Dev for both groups is 10% and the grades are normally distributed. At the 2% level of significance, is there sufficient evidence to conclude that, on average, regular attendees perform:
1) more than five percentage points better than those who did not?
2)better than those who did not?
Solutions
orchestra answered 2 years agoRelated Solutions
the students answered a survey and the following information was obtained. •70% of students regularly attended...
the students answered a survey and the following information was
obtained.
•70% of students regularly attended the classes.
•85% of students who attended the classes passed
.•40% of students who didn’t attend the classes failed.
Alice, a random students from that class, has passed this
course. What is the probability that she has attended the
classes?
An insurance company believes that people can be divided into two classes: those who are accident...
An insurance company believes that people can be divided into
two classes: those who are accident prone and those who are not.
Their statistics show that an accident prone person will have an
accident within a year with a probability of 0.4, whereas the
probability for a nonaccident prone person is 0.2. It is assumed
that 30% of the population is accident prone. Given that a new
policyholder has an accident within a year of purchasing a policy,
what is...
Suppose that a given population can be divided into two parts: those who have a given...
Suppose that a given population can be divided into two parts:
those who have a given disease and can infect others, and those who
do not have it but are susceptible. Let x be the proportion of
susceptible individuals and y the proportion of infectious
individuals; then x + y = 1. Assume that the disease spreads by
contact between sick and well members of the population and that
the rate of spread dy∕dt is proportional to the number of...
B) An insurance company believes that people can be divided into two categories; those who are...
B) An insurance company believes that people can be divided into
two categories; those who are accident prone and those who are not.
The company’s statistics show that an accident-prone person will
have a car accident within a one-year period with probability 0.4,
whereas this probability decreases to 0.2 for a person who is not
accident prone. The data also suggest that 30% of the population is
accident prone. What is the probability that a new policyholder
will have an...
An insurance company believes that people can be divided into two classes: those who are accident-prone...
An insurance company believes that people can be divided
into two classes: those who are accident-prone and those who are
not. Their statistics show that an accident-prone person will have
an accident at some time within a fixed one-year period with
probability 0.4, whereas this probability decreases to 0.2 for a
non-accident-pron person Assume that 30% of the population is
accident-prone.
a) What is the probability that a new policyholder will
have an accident within a year of purchasing a...
Small Group Discussion (Class will be divided into Groups of up to 5 students) We have...
Small Group Discussion (Class will be divided into
Groups of up to 5 students)
We have made the point that managers often attempt to maximize
the contribution margin per unit of a particular resource that
limits output capacity. The following are five familiar types of
businesses:
Small medical or dental practice
Restaurants
Supermarket.
Builder of residential housing.
Auto dealer’s service department.
Instructions:
Within a group of students:
Each student will be assigned one of the five familiar types of
businesses...
Small Group Discussion (Class will be divided into Groups of up to 5 students) We have...
Small Group Discussion (Class will be divided into
Groups of up to 5 students)
We have made the point that managers often attempt to maximize
the contribution margin per unit of a particular resource that
limits output capacity. The following are five familiar types of
businesses:
Small medical or dental practice
Restaurants
Supermarket.
Builder of residential housing.
Auto dealer’s service department.
Instructions:
Within a group of students:
Each student will be assigned one of the five familiar types of
businesses...
GPA of the students who are taking Stat 50 class at bcc follows a normal distribution...
GPA of the students who are taking Stat 50 class at bcc follows
a normal distribution with a mean of 2.87 and a standard deviation
of 0.43. If 35 students who are taking Stat 50 are selected, what
is the probability that their average GPA is more than 2.97?
A) Not enough information is given to find the answer
B) Almost 0
C) 0.084
D) 0.408
2) GPA of the students who are taking Stat 50 class at bcc
follows...
A professor has kept track of test scores for students who have attended every class and...
A professor has kept track of test scores for students who have
attended every class and for students who have missed one or more
classes. below are scores collected so far.
perfect: 80,86,85,84,81,92,77,87,82,90,79,82,72,88,82
missed 1+:61,80,65,64,74,78,62,73,58,72,67,71,70,71,66
1. Evaluate the assumptions of normality and
homoscedasticity
2. conduct a statistical test to assess if exam scores are
different between perfect attenders and those who have missed
class
3. What is the meaning of the 95% confidence interval given from
the R code. What...
can you put this in your own words? Our class was divided into three groups and...
can you put this in your own words?
Our class was divided into three groups and everyone followed
the same procedure and steps. Each group had to keep track of their
daphnia’s rate of growth based on how many lives and reproduce and
how many die. To start off with this experiment, we had to come up
a group name and then filled the “Daphnia life history data sheet”
on which we recorded all our group member’s phone numbers and...
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