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A professor was curious as to whether the students in a very large class she was teaching, who turned in their tests first, scored differently from the class mean on the test. The µ on the test was 75 with σ = 10; the scores were approximately normally distributed. The mean score for the first 20 tests was 78. Did the students turning in their tests first score significantly different from the larger mean at the .05 level?
a) Use the four steps of hypothesis testing
b) Illustrate the distributions involved
c) Calculate the 95% confidence interval (*even if nonsignificant result)
the number of traffic accidents in a town in 10 randomly chosen rainy days in 2012 is as follows 4 0 6 5 2 1 2 0 4 3.
Hoops. A basketball player with a poor foul-shot record practices intensively during the off-season. He tells the coach that he has raised his proficiency.
a company fills bags with fertilizer for retail sale. the weights of the bags of fertilizer have a normal distribution
Marketing meow Chow offers a free coin in each bag of cat food. If each 10,000-bag shipment has one gold coin, 2 silver dollars, 5 quarters, 20 dimes.
In general, what would be the result if judges instructed juries to never make a Type I error?- never make a Type II error?
These included 26,000 deaths from tuberculosis (TB) in 100,000 people who became sick with tuberculosis in 2005.
Consider the problem of representing line segments in a plane. Each segment is represented as a pair of points: a starting point and an ending point. Define a constructor make-segment and selectors start-segment and end-segment that define the rep..
The comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
It was revealed that 120 people had only 1 admission, 81 had 2 admissions, 48 had 3 admissions, 18 had 4 admissions, 18 had 5 admissions, and 15 had 6 admissions or more admissions. Does the data support the mayor's claim?
A research article described a random sample of 584 smokers who tried to quit smoking by using either a nicotine patch or e-cigarettes
the length of human pregnancies from conception to birth varies according to a distribution that is approximately
What is the probability of a child ending up with a bus stop as gender-unbalanced as my son's in our school district - perform the hypothesis test
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