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Following are the total scores of three subjects of seventy four year 8 students from a high school.
10 1 4 6 7 8 911 0 2 3 3 3 6 8 8 8 912 0 0 0 0 1 1 2 2 3 4 6 713 3 3 4 5 6 7 7 9 914 0 1 2 5 7 7 915 0 2 3 4 8 916 1 4 6 6 817 0 7 7 918 1 4 819 4 5 720 3 4 621 2 422 3 623 8242526 2
(a)
(i) Find the five number summary for this data set.(ii) Determine whether there are any outliers and sketch a box-plot showing clearly thresholds and outliers (if any).(iii) Describe the shape of this distribution.
(b)
(i) Find the mean, variance and the coefficient of variation of this data set.(ii) What proportion of total scores are within 1 standard deviation of the mean? Compare this proportion with the corresponding empirical rule and comment.
Forty percent of the sample wanted more local news. What is the 99% confidence interval for the proportion of readers who would like more coverage of local news?
What is the major difference between finding significance and confidence intervals using population samples or using population proportions?
when a result is not extreme enough to reject the null hypothesis explain why it is wrong to conclude that your result
What are the two ways of testing a correlation coefficient for significance?
Explain the difference between independent samples and dependent samples. Classify the following as independent or dependent samples:
What is the probability of selecting a finance or accounting major and what is the probability of selecting a female or an accounting major? Which rule of addition did you apply
1.i have fit the equation y 2.5 3x to a set of data. the residual for the point 5 10 isa.7.5.b.-7.5.c.-27.5.2.i have
1. ross whites machine shop uses 2500 brackets during the course of the year and this usage is relatively constant
Data were collected for a sample of 64 customers. Assume a population standard deviation of $6. At 95% confidence, what is the margin of error?
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
The accounting department at Weston Materials, Inc., national manufacturer of unattached garages, reports that it takes two construction workers mean of 32 hours and standard deviation of 2 hours to erect the Red Barn model.
A machine produces parts with lengths that are normally distributed with ? = 0.59. A sample of 19 parts has a mean length of 76.26.
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