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For the United States, the mean monthly Internet bill is $32.79 per household (CNBC, January 18, 2006). A sample of 50 households in a southern state showed a sample mean of $30.63. Use a population standard deviation of $5.60. Formulate hypothesis for a test to determine whether the sample data support the conclusion that the mean monthly internet bill in the southern state is less than the national mean $32.79.
A nutrition teacher wants to compare the food values of the nutrition and dietetics students with those of the engineering students. She constructed a questionnaire composed of 15 items. The teacher administered the questionnaire to engineering and nutrition students. What conclusion can the nutrition teacher draw about the food value of the students?
Use the sign test to see if there is a difference between the number of days required to collect an account receivable before and after a new collection policy. Use the 0.05 significance level.
Before 33 36 41 32 39 47 34 29 32 34 40 42 33 36 27 After 35 29 38 34 37 47 36 32 30 34 41 38 37 35 28
or a process with a mean of 100, a standard deviation of 10 and an upper specification of 120, what is the probability that a randomly selected item is defective(or beyond the upper specification limit)?
BASED ON PERCENTILES AND PERCENTAGES, WHICH OF THE FOLLOWING SITUATIONS DO YOU PREFER AND WHY? DIFFERENTIATE THE TWO SITUATIONS AND EXPLAIN YOUR CHOICE IN NOT LESS THAN 10 SENTENCES.
A TEST SCORE OF 90% AND A PERCENTILE RANK OF 20.
A TEST SCORE OF 70% AND A PERCENTILE RANK OF 90.
According to official census figures, 8% of couples living together are not married. A researcher took a
random sample of 400 couples in a large metropolitan city and found that 38 of them are not married. Estimate the proportion of unmarried couples in this city with 99.5% confidence.
Identify the missing number.
78,20,?,56,23,
A quality control engineer takes daily samples of 10 electronic components and checks them for inspections. On 200 consecutive working days, he obtained 112 days with zero defective, 76 days with one defective and 12 days with two defective. If these samples can be looked upon as samples from binomial population, obtain the expected or theoretical number of days with zero defective one defective and 2 or more defective.
It is observed that 80% of television viewers watch 'NEWS' what is the probability that as least 80% of the viewers in a random sample of five watch NEWS?
If 10% of a large consignments of eggs are bad, what is the probability distribution of the number of bad eggs in a box of half dozen chosen at random?
