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A waitress believes the distribution of her tips has a model that is slightly skewed to the left, with a mean of $8.90 and a standard deviation of $5.70. She waites on 30 parties. What is the probab
What is the probability that the student is both a junior and an economics major? Given that the student selected is a junior, what is the probability that he is also an economics major?
A statistics professor plans classes so carefully that the lenths of her class are uniformly distributed between 50.0 and 52.0 minutes. Find the probability that a given class period runs less than
A retailer store sales only two styles of stereo consoles, and experiences shows that these are in equal demand. Four customers in succession come into the store to order stereos. The retailer is i
If we assume that attention spans are normally distributed, find a 95% confidence interval for the mean attention span of children playing with this new toy. Then complete the table below.
Find the 90th percentile of BP readings. Statistically speaking what is a plausible range of values that we could expect to see 95% of time in the population.
This table summarizes the distribution of the highest degree completed in the U.S. population of age 25 and over. Describe the shape of the distribution.
The regression equation Credits = 15.4 - .07 Work was fitted from a sample of 21 statistics students. Credits is the number of college credits taken and Work is the number of hours worked per week a
Dr. Alexander is interested in studying the effects of exercise on mood. Participants included 120 children, half assigned to swim 30 minutes per day and the other half assigned to read 30 minutes p
To explain this, be sure to explain whether the null hypothesis should be rejected, the likelihood of that decision being an error, and why it might have been an error (3 pts each x 3). What is the
A university math department administers a placement exam that all prospective students take. Estimate the standard deviation and justify your estimate. please use the emperical rule
For linear regression calculated for a sample of n = 20 pairs of X and Y values, what is the value for degrees of freedom for the predicted portion of the Y-score variance, MSregression?
Find the test statistic F to test the claim that there is no difference among the means. State your hypothesis, draw your curves, label your critical values and your test statistic, state your deci
A particular hair treatment program has caused hair growth in 70% of its users. A random sample of 20 users is obtained. Using the Binomial Probability Distribution, determine the following probabil
On the Wechsler Adult intellience salle, the mean is 100 and the standard deviation is 16. what is the percentile ran of a score of 84:
What is the probability that John will find 15 or more corks defective in a randomly selected box?
If the 9 members of a family - mom, dad and seven kids - are asked to line up for a family photo, with the condition that the youngest child is in the centre, how many distinguishable arrangements
The US-based manufacturer estimates that the probability that the economic and political climate overseas and in Mexico will decline during the next five years is .40, the probability that it will r
They decide to sample random customers who enter the store, and ask them if they have a Ralph's card. Suppose they solicit 400 customers one day, and find that 160 of them have a Ralph's card.
Suppose that the mean weights of male runners follow a normal distribution with unknown mean u and standard deviation o = 5 kg. You compute 95% confidence interval for u. What is the 95% confidence
If using the method of least squares for fitting trends in an annual time series containng 25 consecutive yearly values, a. what coded value do you assign to X for the first year in the series?
Suppose a sample of n = 50 items is drawn from a population of manufactured products and the weight, X, of each item is recorded. Prior experience has shown that the weight has a probability distrib
Suppose that only 25% of all drivers come to a complete stop at an intersection having flashing red lights in all directions when no other cars are visible. What is the probability that , of 20 rand
Find the probability that exactly 8 out of the 10 consumers recognize the brand name. Also find the probability that the number who recognize the brand name is not 8.
a 50 kn block sits on an inclined plane as shown. determine the angle of the incline needed to have the block begin to slip down the plane. the coefficient of friction is 0.17