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1. A national public television network has found that 35% of its contributions are for less than $20, with 45% for $20-$50, and 20% for more than $50. In a random sample of 200 of the contributions to a local station, 42% were for less than $20, 43% were for $20-$50, and 15% were over $50. At the 0.05 level, does the local station's distribution of contributions differ significantly from that experienced nationally?
2. Twenty-five percent of the employees of a large firm have been with the firm less than 10 years, 40% have been with the firm for 10 to 20 years, and 35% have been with the firm for more than 20 years. Management claims to have randomly selected 20 employees to participate in a drawing for a new car. Of the 20 employees chosen, 3 have fewer than 10 years with the firm, 5 have been there between 10 and 20 years, and 12 have been with the firm for over 20 years. At the 0.025 level of significance, evalu- ate management's claim of random selection. Using the chi-square table in Appendix A, what is the most accu- rate statement that can be made about the exactp-value for the test?
the business college wants to know if their graduates are getting paid better than the teaching college. they take a
Company reveal that 70% of the workers are married, 36% are college graduates, and half of the college graduates are married. What is the probability that a randomly chosen worker is?
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
Distribution in Research simulation located on your student website. During the third cycle of the simulation, you need to make a decision about buying machinery.
an overseas shipment of 5 foreign automobiles contains 2 that have slight paint blemishes. if an agency receives 3 of
Tthe population standard deviation is not equal to 8 at the 0.05 level of significance. Calculate the value of the test statistic.
1- ounce chocolate chip cookies resulted in following calorie amounts. At α=0.01 level, is there sufficient evidence that average calorie content is greater than 110 calories.
In the belief that Statistics is too hard, a student claims that the mean score on a final exam is less then 70. 15 scores will be chosen at random to test this claim.
The experiment data in below table was to evaluate the effects of three variables on invoice errors for a company. Invoice errors had been a major contributor to lengthening the time that customers took to pay their invoices and increasing the acc..
What is the probability that a simple random sample of automobile insurance policies will have a sample mean within 25 of the popluation mean.
question 1 an accelerated life test on a large number of batteries revealed that the mean life for a particular use
1- as the confidence level increases while me stays the same does the required sample size increase decrease or stays
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