The owner of a computer repair shop has determined that their daily revenue has mean 7200 and standard deviation 1200. The daily revenue totals for the next 30 days will be monitored.
What is the probability that the mean daily revenue for the next 30 days will exceed 7500?
A) 0.0869 B) 0.9147 C) 0.9131 D) 0.0853
Q. 2Suppose a brewery has a filling machine that fills 12 ounce bottles of beer. It is known that the amount of beer poured by this filling machine follows a normal distribution with a mean of 14.14 onces and a standard deviation of 0.04 ounce.
Find the probability that the bottle contains more than 14.14 ounces of beer.
A) 0 B) 0.5 C) 0.4 D) 1
Q. 3Identify the treatments.
What will be an ideal response?
Q. 4A survey of 500 non-fatal accidents showed that 142 involved uninsured drivers. Construct a 99 confidence interval for the proportion of fatal accidents that involved uninsured drivers. Round to the nearest thousandth.
What will be an ideal response?
Q. 5A psychologist wants to measure the effect of music on memory. He randomly selects 80 students and measures their scores on a memory test conducted in silence.
The next day he measures their scores on a similar test conducted while classical music is playing. The mean score without music is compared to the mean score with music.
A) qualitative, independent B) quantitative, independent
C) quantitative, dependent D) qualitative, dependent
Q. 6If we do not reject the null hypothesis when the null hypothesis is in error, then we have made a
A) Type error B) Type I error C) Type II error D) Correct decision
Q. 7Identify the subjects.
What will be an ideal response?
Q. 8A farmer was interested in determining how many grasshoppers were in his field. He knows that the distribution of grasshoppers may not be normally distributed in his field due to growing conditions.
As he drives his tractor down each row he counts how many grasshoppers he sees flying away. After several rows he figures the mean number of flights to be 57 with a standard deviation of 12. What is the probability of the farmer will count 52 or fewer flights or 60 or more flights on average in the next 40 rows down which he drives his tractor?
A) 0.4959 B) 0.0530 C) 0.0612 D) 0.9388
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