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You are provided with the following statistics from a study done on the number of day two new revolutionary cell phone batteries last while a phone is on, but not used, with all notifications are turned off.
Power Cell
Cell Charge
n70
73
x ¯
418.5
403.7
s x
45.5
30.6
What is the "conservative" degrees of freedom that will be used to construct a confidence interval for the difference of two sample means?
An experimenter wishes to evaluate the effectiveness of four teaching methods among three kinds of students. The study is conducted as a two-way ANOVA.
1.During a recent year, speeding was reported in 12.9% of all automobile accidents in the United States (The World Almanac 2010).
Assuming the ball selection is without replacement. What is the probability that the first ball is red and the second ball is also red?
If it were true that just 2% of the tires produced have surface blemishes, what would be the probability of getting 5 or more with such blemishes in a random sample of 40 tires?
The PCB concentration of a fish caught in Lake Michigan was measured by a technique that is known to result in an error of measurement that is normally distributed with a standard deviation of .08 ppm (parts per million- Give a 95 percent conf..
a survey was conducted in ohio on high school marijuana use. of the 2266 high school students surveyed 952 admitted to
Using the empirical rule (as presented in the book), what is the approximate percentage of light bulb replacement requests numbering between 41 and 51?
The pie chart below shows how the annual budget for a certain company is divided by department. If the total budget is 125,000,000, what amount is budgeted for Support, Sales, and Media combined?
Find the area of the shaded region where a = -0.79 and b = 1.87, the graph may not be drawn to scale. Round to four decimal places
In relative frequency histogram for a large set of GPAs, the mean and the standard deviation are 2.10 and 0.21 respectively. What proportion of GPAs falls within 1.68 and 2.52?
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
In addition, explain why it is important to ensure that your participants understand fully the extent of the research before you begin.
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