Q4\ The random sample of scores on a history test that eight students got on a history test were: 69 84 93 61 79 88 57 67 Calculate the sample mean, sample variance,the sample standard deviation of these scores.

Q: Suppose 1% of students drink more than 3 cups of coffee each day. To check this claim, a researcher…

A: Given that p = 0.01 ,n=133 What is the sampling distribution of the sample proportion? What is the…

Q: A survey in the N.Y. Times Almanac finds the mean commute time (one way) is 25.4 minutes for the 15…

A: Solution: State the hypotheses. Null hypothesis: That is, the mean commute time is not less than…

Q: The mean age of Senators in the 109th Congress was 60.35 years. A random sample of 40 senators from…

A: From the provided information, Sample size (n) = 40 Sample mean (x̅) = 55.4 Population standard…

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A: There are two independent samples which are Fun dash runners and Cool sprint runners. We have to…

Q: A survey in the N.Y. Times Almanac finds the mean commute time (one way) is 25.4 minutes for the 15…

A: The random variable commute time is normally distributed. The sample come from population which…

Q: An ecologist is examining whether the number of fish caught in a large river basin has changed since…

A: Given S1=standard deviation form first sample=1.6S2=standard deviation form 2nd sample=2.1n1=first…

Q: A survey in the N.Y. Times Almanac finds the mean commute time (one way) is 25.4 minutes for the 15…

A:

Q: 7. Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the…

A:

Q: 4. Kyle has a collection of more than 300 songs in his phone that has a mean duration of 2.75…

A: Dear students as per guidelines we solve only first question only when multiple unrelated questions…

Q: Suppose Nielsen would like to test the hypothesis that people spend an average of 156 hours a month…

A: Suppose Nielsen would like to test the hypothesis that people spend an average of 156 hours a month…

Q: cores of the 7 randomly selected students are 35,17,15,31,22,27,38. Complete the table and compute…

A: To find the sample mean, sample variance and sample standard deviation.

Q: An engineer would like to design a parking garage in the most cost-effective manner. He reads that…

A: Given information Hypothesized mean µ = 76.4 inches Sample size (n) = 100 Mean x̅ = 77.1 inches…

Q: The marks obtained by 9 students are given below:         45, 32, 37, 46, 39, 36, 41, 48, 36.…

A:

Q: Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2 and a…

A: From the given information X follows normal distribution with mean µ = 98.2 standard deviation σ =…

Q: When the population standard deviations are not known to us when comparing two population means, we…

A:

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A: Since you have posted a question with multiple subparts, we will solve the first 3 sub-parts for…

Q: The record of 35 randomly selected participants of a marathon was selected. The mean time it takes…

A:

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: From the provided information,

Q: standard deviation using the data in the table. No 1 2 3 4 5 6 Number of points 94 95 100 103 92 82

A: Given : No 1 2 3 4 5 6Number of points 94 95 100 103 92 82

Q: A candy manufacturer has replaced 5.17% of their chocolate bars with a new mystery flavor. Find the…

A: Given: Sample size (n) = 424 p(chocolate bars with a new mystery flavor) = 5.17% = 0.0517

Q: A. A researcher used a developed problem solving test to randomly select 50 Grade 6 pupils. In this…

A: Write the null and alternative hypothesis as: Ho:u=75H1:u≠75

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A: Solution:given:an adventure company runs two obstacle courses, fun dash and cool sprint. the…

Q: From a population of 200 elements, a sample of 81 elements is selected. It is determined that the…

A:

Q: An engineer would like to design a parking garage in the most cost-effective manner. He reads that…

A: Given information Hypothesized mean µ = 76.4 inches Sample size (n) = 100 Mean x̅ = 77.1 inches…

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A:

Q: According to the American Marketing​ Association, in one​ month, 28% of social​ media users were…

A: Given: Population proportion P = 0.28 sample size n = 9

Q: An ecologist is examining whether the number of fish caught in a large river basin has changed since…

A:

Q: The director of research and development is testing a new medicine. She wants to know if there is…

A: Assume that μ is the true average time the medicine relives pain.

Q: Describe the distribution of sample means (shape, mean, standard error) for samples of n= 64…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: ormation that you are given, what was the sample standard deviation of the number of hours that the…

A: The width of the confidence interval is =, Width = Upper Interval - Lower Interval           =4.75 -…

Q: A researcher wish to test the claim that the average cost of tuition and fees at a four year public…

A: Null hypothesis: H0 : μ = 5700 Alternative hypothesis: H1 : μ >5700 Obtain the test statistic…

Q: Suppose that you randomly survey death records for people born in 1900 in Louisiana and compared the…

A:

Q: 2. Does helping another person affect the helper's life satisfaction? To find out, a researcher…

A:

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A: From the provided information,

Q: When dragons on planet Dathomir lay eggs, the eggs are either green or yellow. The biologists have…

A:

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: We want to test the hypothesis

Q: From a population of 2000 elements, the standard deviation is known to be 14. A sample of 49…

A:

Q: The means of two random sampleof sizes 9 and 7 are 196.42 and198.82 respectively. The sum of squares…

A: Given: n1=9n2=7x¯1=196.42x¯2=198.82∑x1-x¯12=26.94∑x2-x¯22=18.73 The sample variances for the random…

Q: The researcher wants to know if there is a significant difference between the group in their second…

A: Given : For those that didn’t take the drug : The overall mean , μ = 3.35  standard deviation of  ,…

Q: suppose the profit a Honda dealership makes on the next 5 Accords it sells are:545, 991, 902, 1,480,…

A: The average of the sample is defined as the ratio of the sum of the numbers to the total number. By…

Q: In a recent year, Washington State public school students taking a mathematics assessment test had a…

A: Given Mean=276.1 Standard deviations=34.4 Random sample=64

Q: According to a survey, the average American person watches TV for 3 hours per week. To test if the…

A: Given Information : According to a survey, the average American person watches TV for 3 hours per…

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A: Given: n1=265x¯1=77.5s1=4.7n2=280x¯2=76.7s2=4.6α=0.10

Q: a) The time a patient must wait before being attended by a physician in a hospital has been observed…

A: (a) The null and alternative hypothesis is, Ho: \mu = 65μ=65 Ha: \mu > 65μ>65 This…

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

A: Solution: Given information: n1=270n2= 220x1= 63.1x2= 63.5 s1= 3.0s2= 3.2

Q: A random sample of sizen=20 has the mean 20 and standard deviation 5. What is the standard error of…

A: It is given that, Standard deviation,σ=5 Sample size, n=20

Q: A random sample of 18 light bulbs is drawn from a normally distributed population. The population…

A: Since, the samples are drawn from the normal population thus sampling distribution of sample mean…

Q: A final exam in math 160 has a mean of 73 with a standard deviation of 7.73. Assume that a random…

A:

Q: a. An ANOVA test can be done because 2 times (the smallest sample standard deviation) is larger than…

A: The following information has been provided:   Company A Company B Company C   2.4 3.1 2.9…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.