Question
In: Statistics and Probability
On an examination in Biochemistry 12 students in one class had a mean grade of 78 with...
On an examination in Biochemistry 12 students in one class had a mean grade of 78 with a standard deviation of 6, while 15 students in another class had a mean grade of 74 with a standard deviation of 8. Using a significance level of 0.05, determine whether the first group is superior to the second group.
Solutions
orchestra answered 1 year agoRelated Solutions
he final exam grade of a statistics class has a skewed distribution with mean of 78...
he final exam grade of a statistics class has a skewed
distribution with mean of 78 and standard deviation of 7.8. If a
random sample of 30 students selected from this class, then what is
the probability that average final exam grade of this sample is
between 75 and 80?
21- Scores on an examination are assumed to have a normal distribution with mean 78 and...
21- Scores on an examination are assumed to have a normal
distribution with mean 78 and standard deviation 6.
a) What is the proportion of scores that are higher than 75?
b) What is the proportion of scores that fall between 75 and
87?
c) Suppose that students scoring in the top 10% of this
distribution are to receive an A grade. What is the minimum score a
student must achieve to earn an A grade?
PLEASE EXPLAIN YOUR ANSWER
1- Students had a mean grade of 70% in the past. After applying a new teaching...
1- Students had a mean grade of 70% in the past. After applying
a new teaching method, the following scores were recorded for a
sample of 9 random students:
Scores
73
63
64
61
66
69
61
70
79
In order to construct a 95% confidence interval for the new mean
grade, we should use:
1-PropZInt
ZInterval
2-SampZInt
2-SampTInt
TInterval
2-PropZInt
2-
Assume that a sample is used to estimate a population proportion
p. Find the 99.5% confidence interval for...
One college class had a total of 80 students. The average score for the class on...
One college class had a total of 80 students. The average score
for the class on the last exam was 84.3 with a standard deviation
of 5.4. A random sample of 34 students was selected.
a. Calculate the standard error of the mean.
b. What is the probability that the sample mean will be less
than 86?
c. What is the probability that the sample mean will be more
than 85?
d. What is the probability that the sample mean...
One college class had a total of 80 students. The average score for the class on...
One college class had a total of 80 students. The average score
for the class on the last exam was 84.6 with a standard deviation
of 5.3. A random sample of 34 students was selected.
a. Calculate the standard error of the mean.
b. What is the probability that the sample mean will be less
than 86?
c. What is the probability that the sample mean will be more
than 85?
d. What is the probability that the sample mean...
One college class had a total of 70 students. The average score for the class on...
One college class had a total of 70 students. The average score for
the class on the last exam was 84.2 with a standard deviation of
4.8. A random sample of 31 students was selected. a. Calculate the
standard error of the mean. b. What is the probability that the
sample mean will be less than 86? c. What is the probability that
the sample mean will be more than 85? d. What is the probability
that the sample mean...
One college class had a total of 8080 students. The average score for the class on...
One college class had a total of
8080
students. The average score for the class on the last exam
was
83.983.9
with a standard deviation of
5.85.8.
A random sample of
3232
students was selected.
a. Calculate the standard error of the mean.
b. What is the probability that the sample mean will be less
than
8585?
c. What is the probability that the sample mean will be more
than
8484?
d. What is the probability that the sample mean...
One college class had a total of 80 students. The average score for the class on...
One college class had a total of 80 students. The average score
for the class on the last exam was 83.9 with a standard deviation
of 5.8. A random sample of 32 students was selected. a. Calculate
the standard error of the mean. b. What is the probability that the
sample mean will be less than 85? c. What is the probability that
the sample mean will be more than 84? d. What is the probability
that the sample mean...
4th Grade (Class 1) 4th Grade (Class 2) 12 10 15 12 21 16 21 17...
4th Grade (Class 1)
4th Grade (Class 2)
12
10
15
12
21
16
21
17
22
17
22
19
22
19
25
22
26
22
27
22
27
27
31
28
32
29
33
29
33
31
36
31
37
31
38
33
41
33
43
37
44
39
45
43
45
43
47
47
55
49
57
57
The collected data is from two 4th grade (All female classes -
Age 10) Fitnessgram pacer tests. Once you have...
In a class of 25 students the average grade on a quiz is 16.85, with a...
In a class of 25 students the average grade on a quiz is 16.85,
with a sample standard deviation of 4.75. The grades are known to
be normally distributed. a. Determine the standard error of the
mean. b. Determine the 98% confidence interval for the class
grades. c. If you wanted a narrower interval, would you increase or
decrease the confidence level?
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