2. Two stores at SM Downtown are selling batteries for cell phones. Store A claims an avera battery life of 12 hours while Store B advertises an average of 14 hours. Why would we need know the standard deviation of the battery life before deciding what brand to buy? Suppose standard deviation are 1.5 hours for A and 1 hour for B. which battervis moro lilrolu

Q: Which of the following is an appropriate test to compare a sample mean with a population mean when…

A: When the population deviation is unknown, we use student t-test So, Option d is correct. i.e. t-test

Q: Data was collected on a disease that mostly affects the elderly. The majority of the patients are…

A: In this case, the Median is the most appropriate measure the center of the distribution of the ages…

Q: If the Standard Deviation of a data set is 2.1, what is the variance of that data set? State your…

A:

Q: Given a binomial variable with a mean of 30 and a variance of 21, what is p?

A: X~Binomial(n , p) Mean=30, Variance=21

Q: Road & Track provides the following sample tire wear and maximum load capacity for automobile tires.…

A: To find the mean of the distribution of X, we need to add all the given values of X and then divide…

Q: R = Ex: 0.654321 Height explains how much of the variance in number of books read? Pick v variance 1

A: Independent variable, X: Height (in inches) Dependent variance, Y: No. of books read in the last…

Q: The homogeneity of variance assumption states that the two population variances are equal. Question…

A: The assumption of homogeneity of variance is a assumption of the independent sample t test and ANOVA…

Q: In ANOVA, the variance for the effect is termed a Mean Square between because mathematically we…

A: Given information : In ANOVA, the variance for the effect is termed a Mean Square between because…

Q: In a study of speed dating, female subjects were asked to rate the attractiveness of their male…

A: Hint: By simple calculations of mean, then range and easily able to find the var. and std.…

Q: Suppose that the weight of a particular hand weight is advertised to be 5 pounds, but it can…

A: Answer  Given  Mean = 5 Minimum value = 4.5 Maximum value =5.1 We know that: Variance = [Range/4]^2.

Q: The range and the variance are both measures of distance.

A: Solution-: The range and the variance are both measures of distance.

Q: In a project you are managing, if you estimated the optimistic(a), most likely(m) and pessimistic(b)…

A:

Q: The following table is the frequency distribution for the amount “screen time” (in hours)  had…

A:

Q: If between-groups variance is small, then we have not observed​      ​experimenter effects.…

A: Followings are the explanation of the question Explanation The ANOVA evaluates whether the group.…

Q: B. -14 to 36 O C. -19 to 31 O D. 6 to 16

A: Given : Mean = u = 11 Variance = σ^2 = 25 Standard deviation = σ = √25 = 5

Q: 5) What effect would adding a constant to each data value in a set have on the mean and variance of…

A: What effect adding a constant to each data value in a set have on the mean and variance of the set.

Q: Jessica hypothesizes that giraffes will look longer at human infants than at adults. In her zoo, she…

A: It is given that Jessica hypothesizes that giraffes will look longer at human infants than at adults…

Q: A student learns that on his most recent exam in psychology, the sample mean was 72.19 with a…

A:

Q: On a scale designed to measure attitude toward immigration, two college classes score as follows:…

A: Enter the data in Excel.

Q: A value of r2=.09 is considered what for the effect size test of the percentage of variance…

A: Given, r2=0.09

Q: The sum of the squared deviation scores is SS = 20 for a sample of n = 6 scores. What is the…

A: The variance of the sample can be calculated as:

Q: Which of the following levels of variability (standard deviation or variance) would most likely…

A: The platykurtic curve has shorter peak and thinner tail compared to normal distribution. The excess…

Q: A researcher is trying to determine if racial background affects income. In a sample of 100 people,…

A: From the above data What proportion of the variance in income can be explained by racial background…

Q: Assume that you have a binomial experiment with p = 0.4 and a sample size of 120. What is the…

A: Given that, From binomial experiment, Probability, p = 0.4 Sample size, n = 120

Q: If the F-statistic is large, then they variance ___ is much larger than the variance ___.

A: We have given that,  If the F-statistic is large, then they variance ___ is much larger than the…

Q: In a study of speed​ dating, female subjects were asked to rate the attractiveness of their male​…

A: we solve this example using Excel: By Round 1 decimal place: range=9 standard deviation=3.0…

Q: What is assumed by the homogeneity of variance assumption? Question 11 options: The two samples have…

A: The objective is to derive the assumption under "homogeneity of variance". The homogeneity of…

Q: Find the value of the test statistic. (Round your answer to three decimal places.) Find the p-value.…

A: x (x-xbar)^2 3.98 0.388544 3.78 0.179211 2.95 0.165378 3.55 0.037378 3.44 0.006944 3.08…

Q: The accounting department analyzes the variance of the weekly unit costs reported by two production…

A: See the handwritten solution

Q: The r2represents the shared variance between a predictor and _______

A:

Q: The amount of money a male spends in a certain clothing store is normally distributed with a mean of…

A: Let X be expenditure by male. Let Y be the expenditure by the female. So, X~N10, 10Y~N22, 16 to…

Q: Print-O-Matic printing company spends specific amounts on fixed costs every month.  The costs of…

A:

Q: Indicate the mean and the standard deviation of the distribution of means for each of the following…

A: We have to find mean and the standard deviation of the distribution of means for given situations.So…

Q: = Variance and Standard Deviation from the following data.

A: We have given the Grouped Frequency data, that is Classes and Frequency. Variance: Variance…

Q: Units Produced # of days 45 13 48 18 50 25 52 19 55 15

A: Given, Units produced (X) no.of days (f) f.X 45 13 585 48 18 864 50 25 1250 52 19 988…

Q: Consider the following data x -4,-3,-2,-1,0 P(X=x) 0.3,0.1,0.2,0.1,0.3 Find the variance. Round your…

A:

Q: The variance (x) corresponds with which of the following ANOVA terms? a. mean square b. treatment…

A: The variance corresponds to which of the following ANOVA terms?

Q: Delays in discharges from immediate health care facilities create unnecessary risks of expenses for…

A: Given that: Facility A: 12, 9, 13, 16, 7, 19, 20, 16, 15, 14, 12, 16 Facility B: 7, 10, 13, 15, 9,…

Q: Suppose it is believed that the probability a patient will die from a certain disease following…

A:

Q: Discuss the following measures of variation in one or two sentences. 1) Range- 2) Standard…

A: The degree to which numerical data tend to spread about an average value is called the variation. A…

Q: One sample has n=7 and SS=35 and a second sample has n =17 and SS =45. What is the pooled variance…

A: Given information: The two sample statistics is given as, Sample 1 n1=7SS1 = 35 Sample 2 n2 = 17SS2…