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The manufacturer of an MP3 player wanted to know whether a 10 percent reduction in price is enough to increase the sales of their product. To investigate, the owner randomly selected eight outlets and sold the MP3 player at the reduced price. At seven randomly selected outlets, the MP3 player was sold at the regular price. Reported below is the number of units sold last month at the sampled outlets.
Regular price
138
121
88
115
141
125
96
Reduced price
128
134
152
$135
114
106
112
120
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
A company makes camshafts. The camshaft lengths need to be within a certain tolerance or they will not fit. They have produced x bar and s charts
A game involving a pair of dice pays you 3 with probability 17/36, costs you 2 with probability 14/36, and costs you 4 with probability 5/36. What is your probability of losing money in one play of the game?
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
The mean of a sample is 22.5. The mean of 1000 bootstrapped samples is 22.491. The bias of the bootstrap mean is
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
Identify the independent and dependent variables, and Construct a nominal, ordinal, and interval level measure for each independent and dependent variable.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
What IQ score should one have in order to be eligible for Mensa?
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
What is the 95% confidence interval for the difference between the mean prices of the two models?
Create a 90% confidence interval for proportion of all kernels that would not pop.
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
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