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Tea Drinkers: A tea drinker's society estimates that the mean consumption of tea by a person in the United States is more than 7 gallons per year. In a sample of 100 people, you find that the
Once the researcher had randomly selected his sample of 100 school psychologists. Write a null hypothesis and a research hypothesis for this study.
The mean health insurance cost per worker per month was $132, and the standard deviation was $32. Calculate a 95% confidence interval for the mean health cost per worker per month for all small comp
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a
The Oil Price Information Center reports the mean price per gallon of regular gasoline is $3.26 with a population standard deviation of $0.18. Assume a random sample of 40gasoline stations is select
What is the point estimate of the number of pieces per package? Construct a 99% confidence interval to estimate the mean number of pieces per package for the population.
A certain airplane has two independent alteratnors to provided electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) bath w
CRA CDs, Inc., wants the mean lengths of the "cuts" on a CD to be 135 seconds (2 minutes and 15 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10-minut
What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course?
As a part of its testing program Sony tests samples of 25 batteries. What can you say about the shape of the distribution of the sample mean?
A teacher figures that final grades in the statistics department are distributed as: A, 25%; B, 25%; C, 40%; D, 5%; F, 5%. At the end of a randomly selected semester, the following number of grades
In addition to being a member of AMS, Joe was also the most popular person on any of the local news programs. What do you think about Joe's assumptions concerning the weather for the next 30 days?
Scores on a midterm exam are normally distributed with a mean of 73 and a standard deviation of 9 points. What z-value represents the 30th percentile?
A particular candidate claims she has the support of at least 60% of the voters in her district. A random sample of 150 voters yields 87 who support her. The candidate wishes to test her claim at t
The amount of time a bank teller spends with each customer has a population mean, u, of 3.10 minutes and standard deviation , O, of .40 minute. If you select a random sample of 16 customers: what i
Construct a 90% CI for the proportion of patients who experience stomach upset with the experimental medication.
find the probability that at most 5 defective bolts will be found in a box of 200 bolts of it known that 2% of such bolts are expected to be defective.(you may take the distribution to be poission;
Suppose that no calls are currently on hold. If the agent takes 5 minutes to complete processing the current call, how many callers do you expect to be waiting by that time? What is the probability
The score distribution is roughly symmetric, has a median 56, and a range of 93. Estimate the standard deviation and justify your estimate.
Rounded to the nearest 100, what is the sample size required for most populations to have survey responses fall within 5.5% of those given by the general population at the 95% confidence level?
If 1st wave of such 5000 emails were sent to the target age group in Hang Road region, What is the probability that 1750 or fewer people will respond and switch their credit card?
Why are the means and standard deviations so different, but the medians the same for the two data sets? Of the two statistics which is most affected by outliers, the range or IRQ?
The mean of a small pilot study was 125 days with a standard deviation of 14 days. If you must estimate the population mean within 2 days, how many sales representatives in the pharmaceutical indust
If 100 randomly selected customers eat at Jan's this Sunday what are mean and standard error of the sampling distribution of mean restaurant expense?
A mechanical press is used to mold shapes for plastic toys. When the machine is adjusted and working well, it still produces about .08 defective toys. The toys are manufactured in lots of n=100.