A random experiment involves drawing a sample of 12 data values from a normally distributed population. The random variable is the range of the data set. 13 21 23 29 29 31 39 39 39 41 45 47 Give the random variable. (Appropriate rounding rules still apply.) r.V. =

Provide an appropriate response. Data sets A and B are dependent. Find a. A 6.1 7.1 9.0 6.0 6.1 8.5 7.4 7.3 7.2 8.6 Assume that the paired data came from a population that is normally distributed. O 0.89 O-0.94 O 0.58 O-0.76

A random experiment involves drawing a sample of 12 data values from a normally distributed population. The random variable is the range of the data set. 47 51 53 54 56 61 61 62 63 63 63 64 Give the random variable. (Appropriate rounding rules still apply.) r.v. =

States. Find the variance and standard deviation for the data. R Class limits Frequency 10-12 2 13-15 18 16-18 10 19-21 8 22-24 3 25-27

An online retailer would like to know whether the proportion of customers who visit the site and make a purchase is different than 50%. A simple random sample of customers is taken. The results of the sample are shown below.

The "Freshman 15" refers to the belief that college students gain 15 lb (or 6.8 kg) during their freshman year. Listed in the accompanying table are weights (kg) of randomly selected male college freshmen. The weights were measured in September and later in April. Use the listed paired sample data, and assume that the samples are simple random samples and that the differences have a distribution that is approximately normal. Complete parts (a) through (c). September 68 71 57 81 68 56 65 64 71 April 64 69 58 82 69 58 68 68 77 a. Use a 0.05 significance level to test the claim that for the population of freshman male college students, the weights in September are less than the weights in the following April. In this example, Hd is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the April weight minus the September weight. What are the null and alternative hypotheses for the hypothesis test? Ho Hd = 0 kg 0 kg H₁…

Complete parts (a) through (e) for the population data below. 2, 4, 6 d. For each of the possible sample sizes, find the probability that the sample mean will equal the population mean. n Probability 1 1 3 2 3 3 1 (Type integers or simplified fractions.) e. For each of the possible sample sizes, find the probability that the sampling error made in estimating the population mean by the sample mean will be 0.5 or less (in magnitude), that is, that the absolute value of the difference between the sample mean and the population mean is at most 0.5. n 1 2 3 Probability (Type integers or simplified fractions.)

The ages​ (in years) of a random sample of shoppers at a gaming store are shown. Determine the​ range, mean,​ variance, and standard deviation of the sample data set.   12​, 20​, 23​, 14​, 18​, 18​, 19​, 18​, 15​, 19   1) The range is ______ 2) The mean is ______ 3) The variance is ________

In looking at the results of a standardized exam, 72% of those taking the test choose the correct answer on the first question. Answer the following for 400 test takers who are to be randomly chosen. After taking the sample and administering the test, 320 of the test takers answer the first question correctly.   The sample proportion is ____________________.         Find the mean and variance for the distribution of sample proportions from samples of size n = 400.   Mean: __________________       Variance: ___________________                 The probability is ____________________ for taking another random sample of size n = 400 test takers and more than 75% of them getting the correct answer on this question.

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