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According to the empirical rule, if the data form a "bell shaped" normal distribution, what percent of the observations will be contained within 3 standard deviations around the arithmetic mean
The probability that a new advertising campaign will increase sales is assessed as being 0.80. the probability that the cost of developing the new ad campaign can be kept within the origiinal budget
A hospital administrator wants to measure average time per hip replacement procedure performed in the institution's operating suite. He is willing to be within 10 minutes of the true value with a pr
Girish Shambu and William Reisel are teammates at a discount store: their new job is assembling bicycles for customers. The assembly of a bike has a learning rate of 80%.
Consider a study in which 41 participants were treated with an intervention. the study reported mean body weight of 140 pounds with a standard deviation of 12.3 pounds. Calculate the 90 confidence i
Medical researches claim that the mean body temperature is not equal 98.6 degrees F for healthy adults. Temperatures were recorded for a random sample of 20 adults. The mean was 97.6 degrees F with
Usually statisticians use an alpha level of either 0.01 or 0.05 or 0.10. Describe what a statistician is trying to avoid by setting the alpha level to be a small number.
Manceville Air has just produced the first unit of a large industrial compressor that incorpotated new technology in the control circuts and a new internal venting system.
The probability that price of a randomly selected single-family homes being less than $200,000? The probability that average price of randomly selected 4 single-family homes being between $100,000 and
For a one-tailed hypothesis test, the critical z-value of the test statistic is -2.33. Which of the following is true about the hypothesis test?
Find the sample mean page views for each website. Find the estimated difference of the sample man(y1-y2), page views of the two websites
If the distribution is approximately normal, the t-test is a more powerful test about the central tendecy of the distribution than the sign test. True or false?
The standard error is 14 grams. The samp dist. for the sample mean is normal with a mean of 110 grams and SD of 14 grams. The samplling distribution for the sample mean is 110 grams.
Of the 23 stocks that the young investor bought over the last 12 months, 13 have increased. Can he claim that is bes better at predicting increases than the typical portfolio manager? Test at a=.05
Write the complex number z =-8 + 4 i in polar form: z = r( \cos \theta + i \sin \theta) where r = and \theta = The angle should satisfy 0 \le \theta < 2\pi.
As we have noted in previous chapters, even a very small effect can be significant if the if the sample is large enough. For each of the following, determine how large a sample is necessary for the
After posting the flags at all such sites, she obtains a random sample of 25 golfers whose mean was 81 with s = 5.73. Do the flags improve the golf scores? Use ?=0.05. Please show all 5 steps of the
Does participation in company decisions have an effect on productivity? Use ? = 0.01. Please show me the steps to work with problem and what hypotheses test do you use to solve.
find the minimum smples size needed, using a prior study that found that 42% of the respondents said they have high speed internet access.
A federal report indicated that 24% of children under age 6 live in poverty in Georgia, an increase in previous years. How large a sample is needed to estimate the true proportion of children within
Determine the residuals and predicted values. Does it appear that the normality requirement is violated? Explain.
The Survey of Study Habits and Attitudes (SSHA)is a psychological test designed to measure the motivation, study habits, and attitudes toward learning of college students. These factors, along with
In the last decade, society in general and the judicial system in particular have altered their opinions on the seriousness of drunken driving. In most jurisdictions, driving an automobile with a bl
Betting on the results of National Football League games is a popular North American activity. In some states and provinces, it is legal to do so provided that wagers are made through a government-a
In many cities, the network national news is broadcast at 6:30 or 7:00 p.m. In most cities, the national news is preceded by local news in the late afternoon or early evening.