07/18/18

usual and unusual values
A certain group of test subjects had pulse rates with a mean of 80.580.5 beats per minute and a standard deviation of 10.510.5 beats per minute. Would it be unusual for one of the test subjects to... more
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05/15/17

Mean = 74 Standard Deviation = 6 using the 68- 95 - 99.7 rule, how many shots did about 95% of golfers take?
Its a golf question, par is 74 and standard deviation is 6. I already made the normal curve and showed the 68 - 95 - 99.7 rule. Need to know how many shots about 95% of golfers took.
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04/27/17

Some kind of Z test
Historically, a manufacturer finds that 1% of integrated circuits of a certain type fail during burn-in testing. Burn-in testing results (pass/fail) on the latest shipment of 10,500 circuits are to... more
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04/25/17

For the set of hypotheses, use the sample information to compute the appropriate test statistic.
Ho: σ = 5.2        α = 0.01 n = 23 s = 6.1H1: σ > 5.2
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04/25/17

Statistics
Assume that the data has a normal distribution, n = 45 and that σ is known. Find the appropriate critical value used to test a null hypothesis about a mean with α = 0.05 for a right-tailed test.
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04/21/17

Probability question
A college offers two courses in Calculus - Calc 1 and calc 2. Last semester, 60.9% of students took calc 1 and the rest took calc 2 ( no student took both the courses). Of the students who took... more
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04/20/17

Test probability
akili has two tests, the probabil that he will pass the first test is 3/4. How he does on the first test affects the second test. If he passes the first test there is a 4/5 chance that he will pass... more
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04/09/17

What are the solutions for x2 - 9x = 0 ? (use factoring)
 Solve using factoring
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04/08/17

Need to find 95% confidence interval using sigma. Mean of averages is 7.29 and standard deviation of averages is .81
Project was to roll 2 dice 5 times and record sums and then repeat this 14 times and then find averages of each row so there is 15 averages. 
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04/07/17

A population has a mean of 89 and a standard deviation of 7. Find the mean and standard deviation of a sampling distribution of sample means with sample size 49
I need to know this. 
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04/03/17

Interept rejecting a null hypothesis, and failing to reject a null hypothesis
A film developer claims that the main number of pictures developed for camera with 27 exposures is less than 25. if a hypothesis test is performed how should you interpret a decision that were (a)... more
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04/02/17

statistics
passing through the intersection of blossom hill road and the Altadena expressway varies from 14 to 35 mph is uniformly distributed. None of the cars travel over 35 mph through the intersection. μ=... more
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03/31/17

A manufacturer makes ball bearings that are supposed to have a mean weight of 30 g.
A manufacturer makes ball bearings that are supposed to have a mean weight of 30 g. A retailer suspects that the mean weight is actually greater than 30 g. The mean weight for a random sample of 16... more
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03/29/17

Statistics: Confidence Intervals
6. Independent random samples were drawn from two normal populations assumed to have the approximatelythe same standard deviation, resulting in the following summary statistics:n1 = 25, s1 = 4.8,... more
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03/29/17

Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean mu equals μ=300 days and standard deviation sigma eq
(a) What is the probability that a randomly selected pregnancy lasts less than 293 days? The probability that a randomly selected pregnancy lasts less than 293 days is approximately nothing. (Round... more
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03/28/17

Describe how you can test claims about a population using a sample?
I don't need a long explanation, just want a simple answer
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03/20/17

Parameter is a measure that describes a
sdaawaaaaaddddddddddddddddddddc wdawsdaesdsa wedsadaew asdawwesd 
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03/20/17

at school funraiser for every 9 boxes of chocolate sold u earn 5 points. If u were to sell 38 boxes how many points would u earn
at school funraiser for every 9 boxes of chocolate sold u earn 5 points. If u were to sell 38 boxes how many points would u earn
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03/18/17

A set of data has an interquartile range of 20 and a lower quartile range of 6. if the data is symmetrica, what is the value of the median?
A set of data has an interquartile range of 20 and a lower quartile range of 6. if the data is symmetrica, what is the value of the median? Please help and explain the outcome..Thanks so much
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03/16/17

2. In a study, a researcher found that 60 of his 240 respondents were Catholics.
2. In a study, a researcher found that 60 of his 240 respondents were Catholics. Estimate the proportion of Catholics in the population at an alpha of 0.1.
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03/16/17

Can you help me please?
A nationally known supermarket decided to promote its own brand of soft drinks on TV for two weeks. Before the ad campaign, the company randomly selected 21 of its stores accross the United States... more
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03/15/17

find the probability
A gardener has 9 tulip, 7 daffodil and 5 crocus bulbs to plant. If he selects 3 bulbs at random to sow what is the probability he sows:i. 2 tulips and a daffodil? ii. 3 of the same flower? iii. At... more
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03/12/17

stats question
For a normal shaped distribution with μ = 50 and σ = 8: A. What proportion of the scores fall between 46 and 54? B. For samples of n = 4, what proportion of the sample means fall between 46 and 54?... more
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02/24/17

Y=10 + 0.9x, where y represents the final exam score and x is the midterm exam score. Suppose Joe scores an 80.What would be the predicted value of his score
A.81B.The answer cannot be determined from the information given.C.82D.91
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02/23/17

Probability Statistics question, a bit confused.
A population of snakes have total lengths: 7cm, 5cm, 10cm, 13cm, and 9cm.   If two snakes are selected at random without replacement (order does not matter), what is the probability that the... more
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