Suppose 20% of grade-school students develop influenza. In a sample of 100 grade-school students, what is...
Suppose 20% of grade-school students develop influenza. In a sample of 100 grade-school students, what is the probability that 30 or more of them will develop influenza?
Homework Answers
mean = np = 100 * 20% = 20
standard error = sqrt(100*20%*80%) = 4
P(X >=30) = P( Z> 30-20/4)
= P(Z > 2.5)
= 0.0062
Add Answer to:
Suppose 20% of grade-school students develop influenza. In a
sample of 100 grade-school students, what is...
30% of the fifth grade students in a large school district read below grade level. The...
30% of the fifth grade students in a large school district read below grade level. The distribution of sample proportions of samples of 100 students from this population is normal with a mean of 0.30 and a standard deviation of 0.045. Suppose that you select a sample of 100 fifth grade students from this district and find that the proportion that reads below grade level in the sample is 0.36. What is the probability that a second sample would be...
Suppose that there are 100 MBA students in the first-year class. Of these students, 20 of...
Suppose that there are 100 MBA students in the first-year class. Of these students, 20 of them have two years of work experience, 30 have three years of work experience, 15 have four years of work experience, and 35 have five or more years of work experience. Suppose that a first-year MBA student is selected at random. a) What is the probability that this student has at least 4 years of work experience? b) Suppose that you are told that...
20 students from each grade at a high school are randomly chosen to participate in a...
20 students from each grade at a high school are randomly chosen to participate in a survey Is this: Convenience Sample, Stratified Random Sample, or Cluster Sample ?
17. Eleventh-and twelfth-grade students at Fairlawn High School were asked whether or not they have their...
17. Eleventh-and twelfth-grade students at Fairlawn High School were asked whether or not they have their own car. The results of the survey are recorded in the following two-way frequency table. Eleventh Grade (E)| -eearte) : NO car Twelfth Grade ( 228 32 Suppose a student is randomly chosen from a list of eleventh-and twelfth-grade students at the high school. What is the probability that the student chosen will be in twelfith grade or have a car? Use probability and...
Suppose that 20% of the students who took a test from school A, and that the...
Suppose that 20% of the students who took a test from school A, and that the average of their scores on the teat was 80. Suppose that 30% of the students were from school B, and the average scores of the school is 76. Finally, suppose that 50% of the students are from school C , and that the average for yhat school is 84. If a student is selected at random from the entire group that took the test,...
Question 20 4 pts A random sample of 100 students at a high school was asked...
Question 20 4 pts A random sample of 100 students at a high school was asked whether they would ask their father or mother for help with a financial problem. A second sample of 100 different students was asked the same question regarding a dating problem. If 43 students in the first sample and 47 students in the second sample replied that they turned to their mother rather than their father for help, test the hypothesis of no difference in...
At school, 40% of students drink coffee. Consider a random sample of 50 students. What is the pro...
At school, 40% of students drink coffee. Consider a random sample of 50 students. What is the probability that less than 30% of these students drink coffee? (Show all applicable work)
3) A tutoring company claims that 75% of the high school students who hire one of...
3) A tutoring company claims that 75% of the high school students who hire one of 3)- their tutors will improve their grades. a. In a sample of 100 high school students, what is the probability that 80% or more improved their grades? b. In a sample of 200 high school students, what is the probability that 80% or more improved their grades?
The reading speed of second grade students in a large city is approximately normal, with a...
The reading speed of second grade students in a large city is approximately normal, with a mean of 91 words per minute (wpm) and a standard deviation of 10 wpm. Complete parts (a) through (f). (a) What is the probability a randomly selected student in the city will read more than 96 words per minute? The probability is nothing. (Round to four decimal places as needed.) Interpret this probability. Select the correct choice below and fill in the answer...
Suppose we have assigned grades for the 11 students in our data: Grade A for Students...
Suppose we have assigned grades for the 11 students in our data: Grade A for Students who scored ≥ 90; B for students who scored ≥ 80 and < 90; C for students who scored ≥ 70 and < 80; D for students who scored ≥ 60 and < 70; F for students that scored < 60. Following the grade scheme, 7 students received an A; 1 student received a B; 0 students received a C; 0 students received a...
17. Eleventh-and twelfth-grade students at Fairlawn High School were asked whether or not they have their own car. The results of the survey are recorded in the following two-way frequency table. Eleventh Grade (E)| -eearte) : NO car Twelfth Grade ( 228 32 Suppose a student is randomly chosen from a list of eleventh-and twelfth-grade students at the high school. What is the probability that the student chosen will be in twelfith grade or have a car? Use probability and...
Question 20 4 pts A random sample of 100 students at a high school was asked whether they would ask their father or mother for help with a financial problem. A second sample of 100 different students was asked the same question regarding a dating problem. If 43 students in the first sample and 47 students in the second sample replied that they turned to their mother rather than their father for help, test the hypothesis of no difference in...
3) A tutoring company claims that 75% of the high school students who hire one of 3)- their tutors will improve their grades. a. In a sample of 100 high school students, what is the probability that 80% or more improved their grades? b. In a sample of 200 high school students, what is the probability that 80% or more improved their grades?
Most questions answered within 3 hours.
-
How much heat is required at constant pressure to melt 1 mole of
ice at -25...
asked 1 minute ago -
Suppose N is a discrete random variable defined by probability
distribution:
n
Pr(N = n)
10...
asked 2 minutes ago -
why are special-interest travelers becoming more important to
tourism service suppliers?
asked 6 minutes ago -
A 50.0-kg child takes a ride on a Ferris wheel that rotates four
times each minute...
asked 28 minutes ago -
What happens to the distribution of gene alleles when a
reproductive isolation arises between different population...
asked 26 minutes ago -
1 – Balance the following
Bi(OH)3 + SnO22- →
SnO32- +
Bi
asked 39 minutes ago -
Explain what we mean by "The electric field at the point marked
X is 10 N/C."...
asked 51 minutes ago -
What is the positive energy states in Dirac’s picture? It says
that it leaves an empty...
asked 49 minutes ago -
A mutual fund manager has a $20 million portfolio with a beta of
1.7. The risk-free...
asked 48 minutes ago -
Given the following contribution margin income statement
Sales (15000 units 35
$/units)
asked 48 minutes ago -
The heights in feet of some of the girls of SEU
are: 5.8, 6.1, 5.9, 5.4, 5.6,...
asked 1 hour ago -
Caspian Sea Drinks is considering the purchase of a new water
filtration system produced by Rube...
asked 1 hour ago