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Maria and Zoe are taking Biology 105 but are in different classes. Maria's class has an average of 78% with a standard deviation of 5% on the midterm, whereas Zoe's class has an average of 83% with a standard deviation of 12%. Assume that scores in both classes follow a normal distribution.A. Convert Maria's midterm score of 84 to a standard z score.
Of these, 36 are seniors, 30 are chemistry majors, and 8 are neither. A student is selected at random from the class. What is the probability that the student is both a senior and a chemistry major?
What is the smallest sample size needed to estimate the mean amount reimbursed to within 50 cents with 90% confidence, if a preliminary study indicates that the sample standard deviation of all amounts reimbursed is $3.00
As an aid for improving students' study habit, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar.
The cholesterol concentration in the yolks of each of a sample of 22 randomly selected eggs laid by free range chickens were found to have a mean value of 9.38 mg/g of yolk and a standard deviation of 1.62 mg/g.
According to the historical data, the life expectancy in the United States is equal to the life expectancy in Germany. A new study has been made to see whether this has changed. Records of 225 individuals from the United States who died recently a..
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
Enter data into SPSS (use two columns: one for coding {0, 1, 2, 3, 4, 5} and one for DV)
Use the normal distribution to approximate the following probability: According to the most recent Davenport student profile, 47% of students have children under 17 living at home with them.
If you were to accept the null hypothesis, even though the null hypothesis was false, what type of error would you have commited?
Committee were chosen from among the workers without regard to gender: Does this represent a binomial random distribution? Why?
Of the 250 students in a blind taste test, 150 (60%) preferred Milwaukee's Best over Natural Light. Then the 90% confidence interval for the student population proportion preferring Milwaukee's Best is:
At the .05 significance level, can the developer conclude there is a difference in the mean income? Use the five-step hypothesis testing procedure.
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