In a medical research class the students were asked to find out the time of their birth. of the 38 students in the class, 18 were born between 12 am and 11:59 am. If we pick 5 students at random:
a) create a probability distributions for the number of students born between 12 am and 11:59 am (A) (label columns and rows; use only what you need; show work-some or all)
b) what is the probability of having 2 or 3 students born between 12 am and 11:59 am
c) what is the probability that you will pick at least 2 students born between 12 am and 11:59 am
d) what is the mean of the number of students born between 12 am and 11:59 am
In a medical research class the students were asked to find out the time of their...
Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 28 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this sample mean. b. Determine and interpret a 90% confidence interval for the mother’s mean age (at student’s birth) in the population of all students at this university. c. How would a 99% confidence interval compare to the 90%...
Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 28 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this sample mean. b. Determine and interpret a 90% confidence interval for the mother’s mean age (at student’s birth) in the population of all students at this university. c. How would a 99% confidence interval compare to the 90%...
12. Adults and high school students were asked four trivia questions. The number of correct answers given by each participant was recorded. To the right is a table showing the results. Complete parts a) through e). 0 1 2 3 4 Total Adults 10 27 48 45 38 168 Students 40 12 11 55 47 165 Total 50 39 59 100 85 333 A) If we select a participant at random, what's the probability we choose an adult who...
A class has five students. What is the probability that exactly two of the students were born on a weekend? What is the number of trials, n, and the constant trial probability, p, for this example? What is the answer to the question given? What are the mean and standard deviation for this situation?
Based on previous research, an academic advisor predicted that tardiness would decrease if students were asked to text their academic counselor as soon as they got to class. A sample of 25 students was selected for the study, and their attendance was monitored for 6 weeks. For the first 3 weeks, the students were asked to text as soon as they got to class. The next 3 weeks, students no longer needed to text. The table shows how many minutes...
Find the probability that in a class of 35 students exactly 3 were born in each of the seven days of the week. Assume that there is no relation between birthday and day of the week.
In a statistics class there are 12 students. Five of the students are seniors and the rest are juniors. Four students are randomly chosen at the same time from the students in the class to lead four study groups of three students each. What is the probability that the sample of four contains an equal number of seniors and juniors The probability of a person being born with six fingers (polydactyly) is one in five-hundred. If two unrelated people are...
Thirty undergraduate students were recruited for a research project in a psychology class. The students were randomly assigned to two different groups: Group A saw a moving fictional movie dealing with the death of a young man in battle. Group B saw a documentary on the war in Iraq, including the numbers of soldier killed or wounded. Empathy was then measured with the Interpersonal Empathy Test which had 25 questions scaled from 1 to 4. Thus test scores could range...
Hypothesis Test. Students in a statistics class were asked, "With whom do you find it easier to make friends?" The options were "Same Sex," Opposite Sex," and "No Difference." Do females find it easier to make friends with the opposite sex than males do? Test at the 05 level. Of 68 recently surveyed males, 15 answered "Opposite Sex Of 137 females, 58 answered Opposite Sex." Question: What is the correct statistical procedure? 1-proportion z test 1-proportion z-interval 2.proportion z test...
Randomly selected students in a statistics class were asked to report the number of hours they slept on weeknights and on weekends. At α = 0.05, the experimenter wants to know if there is sufficient evidence that there is a difference in the mean number of hours slept. Student 1 2 3 4 5 6 7 8 Hours Sun-Thurs 8 5.5 7.5 8 7 6 6 8 Hours Fri-Sat 4 7 10.5 12 11 9 6 9 a. State the hypotheses and identify the claim. b. A student calculates the test statistic using this formula: Is this the correct formula to use for this situation? (Hint:...