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If np> and nq>5, estimate P(more than 4) with n=12 and p=0.7 by using the normal distribution as an approximation to the binomial distribution to the binomial; if np<5 or nq<5, then stat
Every year sixth-grade students in Ohio schools take proficiency tests. The list of sixth-grade reading score changes from the prior year are given below.
Construct a C chart for the number of unsafe acts. Based on the results of (a), is the process in a state of statistical control? What should management do next to improve the process?
With a Mean of 2.0 seconds and Standard Deviation of 0.5
In late 2007, it was reported that 79% of U.S. adults owned a cell phone (data extracted from E.C. Baig, "Tips Help Navigate Tech-Buying Maze", USA Today, November 28, 200, p.5B). Suppose that by th
Whites represent 77.7% of the USA and 38.8% is on welfare, Blacks represent 13.2 % of the USA and 39.8% is on welfare, And Hispanics represent 17% of the USA and 15.7% is on welfare. There's 316 mil
You are unconvinced and are trying to calculate the significance p-value for the null hypothesis: that the support stays on the level 50%. You use normal approximation. What is this p?
Make sure you clearly state both the null and the alternative hypotheses in full sentences. Include the output table; then clearly state the conclusion in the same manner (do not simply say "accept/
A group of investors wants to develop a chain of fast-food restaurants. In determining potential costs for each facility, they must consider, among other expenses, the average monthly electric bill.
The mean weight on my sons football team is 185 pounds with a standard deviation of 20 pounds. Determine the standard z-score and the percentile for the data below:
It is known that the lifetime of a lightbulb is normally distributed with a mean lifetime of 1,060 hrs and a standard deviation of 125 hrs. What is the probability that a randomly selected light bul
An unfair coin comes up heads 38% of the time. If the coin is flipped 12 times, what is the probability that it comes up heads no more than two times?
List some of the risks in using samples to make inferences about populations from which the samples were drawn. What can be done to mitigate these risks?
Give two suggestions regarding how a statistician might generate probability estimates when empirical data is unavailable.
Would experimental effects (such as Hawthorne effects) be a problem in this program? If so, how? Alternatively, what threats to internal validity might exist in this program?
How would you estimate the effectiveness of the treatment? Suppose you had information on age Could you use this information to improve your estimate? Please explain. Suppose you had information on
Space shuttle astronauts consume an average of 3000 calories per day. One meal normally consists of a main dish, a vegetable dish, and two different desserts. The astronaut can choose from 10 main d
The no of coils required for each spring? The maximum static stress in each spring in the modified design
There is sufficient evidence at the 10% significance level to reject the research center's claim that less than 35% of college applications are submitted online.
For the following situation, find the mean and standard deviation of the population. List all samples (with replacement) of the given size from that population.
What is the minimum sample size needed using a prior study that found that 48% of the respondents said they have high-speed Internet access? (Round to nearest whole number.) What is the minimum samp
Suppose there are two people in a room. What is the probability that they have the same birthday? HINT: Find the probability that they have different birthdays and then use the complement.
Organize the interval scores below in a table showing simple frequency, cumulative frequency, and relative frequency. 16 11 13 12 11 16 12 16 15 16 11 13 16 12 11.....draw the appropriate graph to
Organize the ratio scores below in a table showing simple frequency, relative frequency, and cumulative frequency. 49 52 47 52 52 47 49 47 50 51 50 49 50 50 50 53 51 49
Which of the follow samples will have the smallest value for estimated standard error?