18. Text me: The Pew Internet and American Life Project surveyed 2227 adults, asking them about their texting habits. Among men, the mean number of text messages sent per day was 40.9, and among women it was 42.0. Assume that 1085 men and 1142 women were sampled, and that the standard deviations were 56.5 for the men and 51.4 for the women. Can you conclude that the mean number of text messages differs between men and women? Use the α = 0.05 level of significance.

Q: (7) The commuting distance(in miles) for 12 students is listed below. 11.5, 21.9, 12.7, 9.0, 19.2,…

A: 7)Given data is11.5, 21.9, 12.7, 9.0, 19.2, 18.5, 19.3, 1.9, 19.2, 0.8, 28.8, 17.7

Q: two classes, one with 18 students and one with 21 students, took an assesment and obtained an…

A: The overall mean is, x̄ = 55.0.The number of students in class 1 is, n1= 18.The mean score of the…

Q: A study was conducted to help understand the effect of smoking on sleep patterns. The time in…

A: The 2 groups are nonsmokers and smokers. We are about to draw conclusions based on the statistical…

Q: The Pew Internet and American Life Project surveyed 2227 adults in 2011, asking them about their…

A: It is given that the mean number of text messages sent per day is 40.9 for men, 42.0 for women. The…

Q: As part of a dissertation at Oklahoma State University, Ota Lutz investigated the effect of teaching…

A: Test Statistic for Difference of two means is given by,   X bar= (summation Xi)/n S2= E(X2)-Xbar2…

Q: As part of a dissertation at Oklahoma State University, Ota Lutz investigated the effect of teaching…

A: The Independent Samples t Test compares the means of two independent groups in order to determine…

Q: An interesting research question is an effect, if any, that different types of teaching formats have…

A: Data for hybrid students-sample 1The sample size The sample mean The sample standard deviation Data…

Q: 2. A study reported in The Journal of Consumer Research dealt with the influence of touch on…

A: Given that,Females diners who were touched:The sample size  is 35.The sample mean  is 3.84.The…

Q: an of sampling distribution of 24.49. Wha

A: Given, μx-=24.49

Q: b. For a sample of engineers, the mean salary is $95,000 with a standard deviation of S30,000. The…

A: Given data: The mean of salary is m = $95000. The standard deviation is σ = $30000. The median…

Q: Suppose you plan to take a survey of Math&146 students asked how many miles they commute from their…

A: Given,Confidence Interval = 95%ME= Margin of Error =1.5σ=Population Standard Deviation=5.3

Q: To begin to better understand personal experiences of headache pain, a drug manufacturer has asked 9…

A: We have given that23,14,49,59,44,36,28,17,49

Q: Construct a sample (with at least two different values in the set) of 55 measurements whose mean is…

A: We will have to keep 55 measurements in the set. And the mean has to be equal to the median.  Let…

Q: There are 12 employees in a particular division of a company. Their salaries ha a median of $48,000,…

A: Given: Mean salary of 12 employees = $ 65,000 Median salary of 12 employees = $ 48,000 Standard…

Q: What is the sum of the deviation scores for the data in the frequency distribution table below?

A: Sum of deviation  of scores from mean is always zero.

Q: TRUE OR FALSE: A z-score indicates the number of standard deviations a data value is ab below the…

A: Standardized z-score: The standardized z-score represents the number of standard deviations the data…

Q: If the heights of intramural college basketball players are normally distributed with mean u =…

A: Given,μ=70σ=6.5P(63.5<X<76.5)=?

Q: In its Fuel Economy Guide for 2008 model vehicles, the Environmental Protection Agency gives data on…

A:

Q: Give 2 examples of Mean in Measure of central tendency to ungrouped data

A: Introduction: It is required to provide two examples of calculating the mean of ungrouped data.

Q: The Acme Company manufactures widgets. The distribution of widget eights is bell-shaped. The widget…

A: According to the given information in this question We need to answer two parts

Q: Suppose an SAT preparation course makes the following statement in their advertising brochure: “We…

A: Given that Suppose an SAT preparation course makes the following statement in their advertising…

Q: Is there any skewness suggested by the mean, mode and median of the ungrouped data?

A: Skewness means lack of symmetry. The values of mean, median and mode fall at different points, they…

Q: If a set of exam scores forms a symmetrical distribution, what can you conclude about the students’…

A: The set of exam scores forms a symmetrical distribution.

Q: nd the mean and the median of the contents. he third value was incorrectly measured and is actually…

A: Given See the handwritten solution

Q: If the distribution of scores were normally distributed, the following would be true? -Mean = 36.5,…

A: Answer : - Given, the distribution of scores were normally distributed.                   Find the…

Q: 24. Suppose annual salaries for sales associates at Target have a mean of $32,500 and a standard…

A: According to the provided information, Mean (μ) =$32500 Standard Deviation (σ) = $2500

Q: In a 2015 study entitled How Undergraduate Students Use Credit Cards, it was reported that…

A: Here we have to identify What type of t-test should be used here

Q: In its Fuel Economy Guide for 2019 model vehicles, the Environmental Protection Agency gives data on…

A:

Q: Give two situations in which comparing two population standard deviations would be important

A: Two situations in which comparing two population standard deviations would be important is obtained…

Q: The Acme Company manufactures widgets. The distribution of widget eights is bell-shaped. The widget…

A: Let X be the random variable from normal distribution with mean (μ) = 63 and standard deviation (σ)…

Q: A researcher collected data on the palate length of 50 individual shrews of the same species.. She…

A: In this question, a researcher has collected data on the palate length of 50 individual shrews of…

Q: 3. Determine the preferred measure of central tendency for the sample whose observations 18, 10, 11,…

A:

Q: In a moderately asymmetrical distribution the values of mode and mean are 32.1 and 35.4…

A: Solution:

Q: 3) A sample of 10 students scored the following grades: 15, 19, 17, 39, 33, 20, 18, 37, 31, 35.…

A: 3) i) To find the median we arrange the data first  15   17   18   19   20   31   33   35   37   39…

Q: rchers published a study that investigated the degree to which a country's households waste food.…

A:

Q: if a data sample has a mode of 140, a median of 130, and a mean of 120 is the distribution of the…

A: We have given thatMode = 140Median = 130Mean = 120

Q: 3(a). Develop hypotheses that can be used to determine whether mean annual Medicare spending in…

A: Given that ; μ = $ 6883 n = 49  Sample mean = $ 5978.32 s = $ 2513 By using this information we…

Q: The Sum of Squared Errors for a data set of 18 numbers is 64. What is the standard deviation?

A: Given thatThe sum of squared errors of data set (SS) = 64Number of data values in data set (n) =…

Q: During a quality assurance check, the actual contents (in grams) of six containers of protein powder…

A: Given: n = 6 Formula Used: Mean = ∑Xin Median = 2(n+1)4thterm

Q: Imagine that every elementary school in California is measured on several characteristics and then…

A: From the provided information, Mean (µ) and standard deviation (σ) of the school in Los Angeles…

Q: Give 2 examples of Median in Measure of central tendency to ungrouped data

A: Median: Median is the middle most value of a set of observations.

Q: An economist would like to estimate the mean amount of money that a family spends to within $36. If…

A: Given that  Population standard deviation =200 Margin of error =E =36 91% confidence.