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- Many Walmart stores have automotive departments where customers can buy tires, have their vehicles serviced, and obtain other automotive services. Recently, the manager at an Ohio Walmart collected data on the time customers had to wait to get the desired automotive service. Of the 500 cars in the sample, the shortest time any customer spent waiting was 3 minutes and the longest time was 183 minutes. Assuming that the manager wishes to develop a frequency distribution with 9 classes, which of the following would be an appropriate class width for each class? A) 19.99 B) 3 to 23 C) 20.00 D) 10.50Recent surveys have shown a decline in the percentage of U.S. households withcable TV. In one city, a simple random sample of 468 households had 117households reporting they had cable TV, and 351 households reporting they didnot.(a) Show the “plug-in” box to represent our best guess for the relative frequency ofpeople with and without cable. (Let 1 correspond to with cable and 0 without).(b) The percentage of households in the city with cable TV is estimated to be___________%, and this estimate is likely to be off by about ___________% or so.(c) A 90%-confidence interval for the percentage of households in the city withcable TV goes from ___________% to ___________%.a) Construct a frequency distribution table using the less-than method. Use eight classes with equal intervals. For all these 100 data 62.4 59.0 57.4 62.1 65.6 71.7 58.8 52.8 57.6 60.8 60.5 52.4 58.0 58.3 42.3 63.4 62.7 58.2 56.8 55.8 57.3 68.2 54.0 57.1 57.5 57.9 56.1 63.5 61.8 58.7 55.7 56.0 64.6 65.7 60.4 61.7 55.0 62.1 61.2 60.3 58.0 64.9 63.8 58.9 56.0 55.2 57.1 57.2 65.8 73.6 54.1 58.3 59.2 68.1 63.1 55.2 64.6 59.2 54.5 59.1 63.8 62.5 63.2 68.7 62.8 56.9 57.4 54.9 67.7 56.7 54.4 68.9 53.3 69.2 59.5 60.1 65.9 58.3 54.2 63.5 61.9 61.5 62.5 57.6 58.7 68.1 51.2 59.3 57.2 57.5 60.2 62.7 54.9 52.4 65.9 61.4 53.0 61.1 57.4 59.9 b) Perform a goodness-of-fit test, at the 5% significance level, to determine whether the data fits a normal distribution with the mean,59.836 and standard deviation, 4.898
- The venomous eastern cottonmouth is a water snake. It is also viviparous, meaning it gives birth to live babies, not eggs like many reptiles. Here is a random sample of litter sizes from the eastern cottonmouth.5 12 7 3 6 8 12 3 7 4 9 6 12 7 5 6 10 3 10 8 6 12 5 6 10 63 8 4 5 7 6 11 7 6 8 10 14 8 7 11 5 4 Using a TI 84 graphing calculator: Construct an 85% confidence interval for the population meanlitter size, µ. Round to tenths and write a sentence answer. Give sample mean and standard deviation. Be sure to show calculator commandsAssume that in your liguistics class you have earned the test scores 83, 74, 54, and 64; and only one test remains. If you need a mean score of 70 to earn a "C", then what minimum score must you obtain on the last test?Find the 95% confidence interval for the mean of each group. Date 2020 2021 1-Nov 55 61 2-Nov 47 52 3-Nov 57 55 4-Nov 67 53 5-Nov 70 55 6-Nov 73 55 7-Nov 77 56 8-Nov 80 68 9-Nov 79 72 10-Nov 76 67 11-Nov 72 67 12-Nov 60 65 13-Nov 54 64 14-Nov 54 47 15-Nov 66 50 16-Nov 54 50 17-Nov 49 61 18-Nov 38 72 19-Nov 50 50 20-Nov 65 49 21-Nov 66 56 22-Nov 60 50 23-Nov 55 45 24-Nov 50 46 25-Nov 61 59 26-Nov 68 48 27-Nov 62 43 28-Nov 57 43 29-Nov 59 44 30-Nov 67 41
- Use the given categorical data to construct the relative frequency distribution. Natural births randomly selected from four hospitals in a highly populated region occurred on the days of the week (in the order of Monday through Sunday) with the frequencies 52, 65, 68, 56, 61,46,52. Does it appear that such births occur on the days of the week with equalfrequency? Construct the relative frequency distribution. Day Relative Frequency Monday % Tuesday % Wednesday % Thursday % Friday % Saturday % Sunday % Let the frequencies be substantially different if any frequency is at least twice any other frequency. Does it appear that these births occur on the days of the week with equal frequency? A. No, it appears that births occur on the days of the week with frequencies that are substantially different. B. Yes, it appears that births occur on the days of the week with frequencies that…The size of the p-value is influenced by the type of alternative hypothesis (either one or two-tailed). Group of answer choices True FalseWhich of the following statements is true about cluster sampling? Once clusters are selected, participants are randomly selected from those clusters. Cluster selection does not have to be random, as long as each chosen cluster is randomly sampled. Cluster sampling uses clusters, which are homogenous groups in regard to characteristics being studied. Participants within clusters usually live within close proximity, which saves time and money for data collection.
- The following figures show the distribution of digits in numbers chosen at random from a telephone directory. Digit 0 1 2 3 4 5 6 7 8 9 Frequency 1026 1107 997 966 1075 933 1107 972 964 853 Test at 5 % level whether digits may be taken to occur equally frequently in the directory.(a) An analysis of access time to a computer disc system was made during therunning of a particular computer programme, which used disc file handlingfacilities. The results of the 1290 access times were as follows:Access time in milliseconds Frequency30 but less than 35 - 1735 but less than 40 - 24 40 but less than 45 --- 19 45 but less than 50 ---- 2850 but less than 55 - 19 55 but less than 60 ---- 13 Required:I. Determine the mean access time for this programme. II. Determine the standard deviation of the access time for this programme. III. Interpret for your manager, who is not familiar with grouped data, what the results of parts (i) and (ii) mean.A random sample of adult males was obtained and asked whether they belonged to a fraternal organization. The results are given in the following one-way frequency table;