8,918 Answered Questions for the topic statistics
Statistics Math
02/21/22
A 90% confidence intervals…
A 90% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.25, 0.41).(d) What is the standard error of the estimate? (Round to 3 decimal...
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Statistics Math
02/21/22
A computer manufacturing company claims…
A computer manufacturing company claims that only 7.3% of their computers are returned. Kelly thinks that the company is misrepresenting the true proportion of computers that are returned, and that...
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Statistics Ap Statistics
02/21/22
Fifty patients suffering from knee pain have volunteered to par- ticipate in an experiment to examine the effects of pain relief medication.
Fifty patients suffering from knee pain have volunteered to participate in an experiment to examine the effects of pain relief medication. Half will be assigned to take 400 mg of the pain reliever...
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Statistics Ap Statistics
02/21/22
A diligent statistics student recorded the length of his faithful #2 pencil as he worked away on his homework.
A diligent statistics student recorded the length of hisfaithful #2 pencil as he worked away on his homework.He discovered a strong linear relationship between thenumber of hours that he worked and...
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Statistics
02/20/22
a. What percentage of sales are greater than $13,000? b. What percentage of sales are less than $8,000? c. What percentage of sales are between $8,000 than $12,000?
1. The sales in a store are normally distributed with a mean of $10,000 and a standard deviation of $2000. a. What percentage of sales are greater than $13,000? b. What percentage...
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Statistics
02/20/22
a. What is the mean number of sales? b. What is the standard deviation of number of sales? c. Complete the table below.
1. The probability that a person buys a car from a particular dealership after a test-drive is 25%. From a sample of 100 people that took a test-drive, a. What is the mean number of...
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Statistics
02/20/22
College statistics
A researcher is interested in finding a 90% confidence interval for the mean number of times per day that college students text. The study included 103 students who averaged 34.9 texts per day. The...
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Statistics
02/20/22
College Statistics
The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in city. The study included 169 residents whose mean number...
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Statistics
02/20/22
College statistics
The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in city. The study included 169 residents whose mean number...
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Statistics
02/20/22
Please help me :(
In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37.1 and standard deviation of $14.7. Estimate how...
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Statistics
02/20/22
I don’t like statistics
A botanist wishes to estimate the typical number of seeds for a certain fruit. She samples 70 specimens and counts the number of seeds in each. Use her sample results (mean = 18.7, standard...
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02/19/22
A computer manufacturing company claims…
A computer manufacturing company claims that only 7.3% of their computers are returned. Kelly thinks that the company is misrepresenting the true proportion of computers that are returned, and that...
more
02/19/22
A 90% confidence intervals for the proportion…
A 90% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.25, 0.41).(a) What is the sample proportion of students with brown hair? (Round to...
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02/19/22
A poll of 855 home sellers found that 28.7%…
A poll of 855 home sellers found that 28.7% were trying to sell their home without a real estate agent. The margin of error for this poll was 3.6%. Find the approximate confidence level used by the...
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02/19/22
A researcher would like to estimate the proportion…
A researcher would like to estimate the proportion of home-based businesses owned by women. What is the minimum sample size needed to be 99% confident with a 3.9% margin of error? (Round your...
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02/19/22
A local five-star restaurant asks its patrons to…
A local five-star restaurant asks its patrons to fill out a quick satisfaction survey (is the patron satisfied or not) after their meal, and the restaurant claims that their satisfaction rating is...
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02/19/22
A newspaper conducted a statewide survey…
A newspaper conducted a statewide survey concerning a proposal to raise taxes in order to prevent budget cuts to education. The newspaper took a random sample (assume it is an SRS) of 500...
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02/19/22
In a large population of adults, the mean IQ is 123 with a standard deviation of 17.
In a large population of adults, the mean IQ is 123 with a standard deviation of 17. Suppose 60 adults are randomly selected for a market research campaign. (Round to 2 decimal places for all...
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02/19/22
Suppose 3% of students drink more than 3 cups…
Suppose 3% of students drink more than 3 cups of coffee each day. To check this claim, a researcher randomly selected a sample of 124 students and found that 5 drink more than 3 cups of coffee each...
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02/19/22
Andy is a restaurant owner: He believes 85% of his customers are satisfied…
Andy is a restaurant owner: He believes 85% of his customers are satisfied with the food quality of his restaurant: From a random sample of 96 customers, what are the following probabilities?...
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Statistics
02/19/22
A particular fruit's weights are normally distributed, with a mean of 255 grams and a standard deviation of 10 grams. The heaviest 9% of fruits weigh more than how many grams?
Statistics
02/19/22
A professor collected data from one of her classes to investigate the relationship between study time per week
What are the least squares regression line for this data14, 25, 15, 5, 10, 12, 5, 21 GPA: 3.1, 3.7, 3.4, 3.0, 3.1, 3.3, 2.7, 3.82.Based on data what is the slope and interpret the meaning in...
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Statistics
02/19/22
A professor collected data from one of her classes to investigate the relationship between study time per week.
What are the explanatory and response variables
Statistics
02/19/22
A professor collected data from one of her classes to investigate the relationship between study time per week (average number of hours) and college GPA. The data or as shown is listed below
Use strapplet.com to generate needed infothe data is14, 25, 15, 5, 10, 12, 5, 21 ; GPA : 3.1, 3.7, 3.4, 3.0, 3.1, 3.3, 2.7, 3.8
Statistics
02/19/22
maxium margin error
You measure 26 dogs' weights, and find they have a mean weight of 36 ounces. Assume the population standard deviation is 10 ounces. Based on this, what is the maximal margin of error associated...
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