1,029 Answered Questions for the topic Statistics Question

Statistics Question

10/05/15

Need help not good in this course
An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and 171 lb. The new population of pilots has normally distributed weights... more
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Statistics Question

10/03/15

P(x>38)= round to the four decimal place
P(x>38)= round to the four decimal place-   assume the random variable x is normally distrubuted with mean u=5 and standard deviation 0=7, compute the probabilty
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Statistics Question

10/01/15

9) The Australian sheep dog is a breed renowned for its intelligence and work ethic. It is estimated that 40% of adult Australian sheep dogs weigh 65 pounds or
9) The Australian sheep dog is a breed renowned for its intelligence and work ethic. It is estimated that 40% of adult Australian sheep dogs weigh 65 pounds or more. A sample of 12 adult dogs is... more
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Statistics Question

10/01/15

A tablet PC contains 8152 music and video files. The distribution of file size is highly skewed.
Assume that the standard deviation for this population is 0.84 megabytes (MB). Suppose that the true mean file size of the music and video files on the tablet is 7.6 MB and you plan to take an SRS... more
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Statistics Question

09/30/15

statistics word problem
A student participated in one game in each of two rounds. 6 of 32 games were lost by his team during the first round. 5 of 32 games were lost by his team during the second round. What are the odds... more
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Statistics Question

09/29/15

Statistic question
Given the following data:222-233-254-241-251-268-276-220-238-253-249-236-247-256-261-227-257-244-239-242a) Construct a frequency distribution using 6 classes.b) Construct a relative frequency... more
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Statistics Question

09/28/15

In a survey of 7000 women 4431 say they change their nail polish once a week. Construct a 90% confidence interval for the population proportion of women who cha
in a survey of 7000 women 4431 say they change their nail polish once a week. Construct a 90%  interval for the population proportion of women who change their nail polish once a week.
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Statistics Question

09/27/15

Please help me with this probibility problem
Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.42   The table below describes the probability of... more
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Statistics Question

09/25/15

statistics word problem help
One of Umbrella Corporation's manufacturing plants makes two independent products, X and Y. The cost to make X is $ 0.7 per unit and the cost to make Y is $ 0.1 per unit. There is a monthly fixed... more
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Statistics Question

09/23/15

What would cause the mean to be less than the median
What would cause the mean to be less than the median, and under what conditions would the mean and the median be close to one another?
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Statistics Question

09/22/15

statistic help
I have no Idea what to do with this!!!!!   Below are 36 sorted ages of an acting award winner. Find P90 using the method presented in the textbook 24, 26, 32, 33, 34, 35, 37, 37, 38, 3939, 41,... more
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Statistics Question

09/21/15

Statistics problem
I'm having a lot of trouble with this problem   Listed below are the duration (in hours) of a simple random sample all flights of a space shuttle program. Find the range, variance, and standard... more
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Statistics Question

09/21/15

Statistics problem
Refer to the data set of times, in minutes, required for an airplane to taxi out for takeoff, listed below.   47, 50, 46, 28, 48, 34, 46, 45, 17, 45, 16, 1614, 23, 27, 50, 46, 12, 27, 22, 13, 48,... more
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Statistics Question

09/21/15

Statistcs help
I'm lost on this one   Listed below are the duration (in hours) of a simple random sample all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample... more
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Statistics Question

09/19/15

On a TV game show, a contestant is shown 8 products from a grocery store and is asked to choose the three least-expensive items in the set, and then correctly a
On a TV game show, a contestant is shown 8 products from a grocery store and is asked to choose the three least-expensive items in the set, and then correctly arrange these three items in order of... more
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Statistics Question

09/19/15

On a TV game show, a contestant is shown 8 products from a grocery store and is asked to choose the three least-expensive items in the set. The three chosen ite
On a TV game show, a contestant is shown 8 products from a grocery store and is asked to choose the three least-expensive items in the set. The three chosen items need not be in any particular... more
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Statistics Question

09/19/15

An investor is considering a $25,000 investment in a start-up company. She estimates that she has probability 0.05 of a $15,000 loss, probability 0.15 of a $20,
An investor is considering a $25,000 investment in a start-up company. She estimates that she has probability 0.05 of a $15,000 loss, probability 0.15 of a $20,000 loss, probability 0.35 of a... more
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Statistics Question

09/19/15

An investor is considering a $25,000 investment in a start-up company. She estimates that she has probability 0.05 of a $20,000 loss, probability 0.2 of a $20,0
An investor is considering a $25,000 investment in a start-up company. She estimates that she has probability 0.05 of a $20,000 loss, probability 0.2 of a $20,000 profit, probability 0.15 of a... more
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Statistics Question

09/19/15

Probabilities
When company X ships a dozen eggs, there is a 3% chance that exactly one egg will be broken, a 0.5% chance that the whole dozen will be broken, but no chance that any other number of eggs will be... more
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Statistics Question

09/18/15

Statistcs help
Below are 36 sorted ages of an acting award winner. Find the percentile corresponding to age 37 using the method presented in the textbook.18 19 19 20 21 23 26 27 29 30 30 30 33 34 35 35 37 39 40... more
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Statistics Question

09/18/15

Statistcs help
With a height of 63 in, Johnson was the shortest president of a particular club in the past century. The club presidents of the past century have a mean height of 66.5 in and a standard deviation... more
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Statistics Question

09/18/15

Statistcs help
I don’t know I don’t know if the statistics is done on this site however here is my problem and I don’t not have answered this. My booklet says Listed below are the errors between the predicted... more
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Statistics Question

09/17/15

Find the probability that the number of smokers in the sample would be none.
Let say the percentage American adults smoker is 20. Suppose we take a simple random sample of 10 adults. Find the probability that the number of smokers in the sample would be none. (Binomial... more
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Statistics Question

09/17/15

When, if ever, should a researcher use a one-tailed p-value for alpha?
Would researchers use a one-tailed p-value for alpha, if so when?
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Statistics Question Statistics Statistics Method

09/15/15

How do you figure out if coefficients are statistically significant at a certain level?
I have a table with regression statistics, cofficients, SE, t-stat, p-value, lower 85% and upper 95%.   I'm not even sure where to start.   1. I need to find statistical significance at 10% 2.... more
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