show work please 2. A random sample of 8 families was asked how many vehicles they...
Seventy-two families were asked how many pets they have with the following results. Find the Mean, Median, and Mode of the data set. Show your work for the Mean. MEAN: (Show your work.) MEDIAN: (Show your work.) MODE: Number of pets Number of families 0 10 1 20 2 22 3 12 4 6 5 2 Total 72
A random sample of n = 100 elementary school students were asked how many summer camps they have been in a certain year. This sample yielded a mean of 3.2 and a standard deviation of 1.6. How many standard errors from the null hypothesis value of 3 is the sample mean of 3.2? 2.33 1.25 2.58 1.69
Problem #14) A survey of 1000 families was conducted to find how many dogs were owned by each respondent. The following table summarizes the results. Number of Dogs: Xi Number of families: Frequency 0 236 1 310 2 282 3 122 4 50 Total 1000 a) Calculate the mean (See table): Justify you answers. μ = round to 2 decimals. b) Determine the variance σ 2 = ξ − μ 2 = round to 4 decimals c) Compute the standard deviation σ...
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45 randomly selected adults were asked how many haircuts they have each calendar year. Let the variable X represent the number of annual haircuts the person has in a calendar year. The results are as follows: # of Haircuts 0 1 2 3 4 5 Frequency 9 6 5 11 9 5 Round all your answers to 4 decimal places where possible. The mean is: The median is: The sample standard deviation is: The first...
A random sample of students was asked for the number of semester hours they are taking this semester. The standard deviation was found to be 4.7 semester hours. a) how many students should be included in the sample to be 90% sure that the sample mean is within 1 semester hour of the population mean for all students at this college?
4.) A random sample of students was asked for the number of semester hours they are taking this semester. The sample standard deviation was found to be = 4.7 semester hours. How many students should be included in the sample to be 99% sure that the sample mean is within 1 semester hour of the population mean for all students at this college? Include units in your answer.
10. A random sample of boarding school students was asked how many 8-ounce servings of soda they had consumed on a certain Sunday and how many hours of sleep they got that night. Their responses are displayed in the scatter plot below. Soda Sleep 0 6 0 8 1 6 1 7 2 7 3 5 3 8 4 6 5 5 6 3 6 6 7 4 7 6 8 3 10 2 a) Which variable has been used...
In Table 4.4 the random variable X represents the number of boys in families with 4 children. TABLE 4.4 Number of boys in families with 4 children х Pr(X= x) 0 1 1/16 1/4 3/8 (a) What is the expected value of X? What does it mean? (b) What is the standard deviation of X? (c) What is the cdf of X? 2 3 4 1/4 1/16
How many computers? In a simple random sample of 150 households, the sample mean number of personal computers was 2.91. Assume the population standard deviation is a =0.57. 5 alo Part: 0 / 4 Part 1 of 4 (a) Construct an 80% confidence interval for the mean number of personal computers. Round the answer to at least two decimal places An 80% confidence interval for the mean number of personal computers is <<
A group of adults were asked how many children they have in their families. The bar graph below shows the number of adults who indicated each number of children. 73 6 5 4 3 2 0 1 2 3 Number of Children How many adults were questioned? What percentage of the adults questioned had 1 children? What percentage of the adults questioned had 2 or less children? O e nd SAMSUNG