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- Which has a better relative position: a score of 50 on a statistics test with a mean of 40 and a standard deviation of 10 or a score of 40 on an accounting test with a mean of 20 and a variance of 20? 1) second is better2) first is better 3) the sameLower Class Limit 이 3 6 9 نا Upper Class Limit 12 2 5 8 11 14 Frequency 2 5 3 1 1 Determine the skewness if the data given is a sample.Make a similarity and differences of statistic and parameter using venn diagram
- The mean score and standard deviation of the test scores of students in Section 208 of a statistics course are 25.4 and 4.85 respectively while the mean score and standard deviation of the test scores of students in Section 209 in the course are 22.3 and 4.85 respectively. a) Which section did better on average? b) In which section are students scores less varied ?University -. Home - » Students 8-3 Homework: Chapter 8 (Sections 8... 車 Question 7- 8-3 Homework: Chapte... appendixd.jpg 945 nework: Chapter 8 (Sections 8.4 throug... i Saved Help Save & Exit Subr Check my worl A random sample of 16 pharmacy customers showed the waiting times below (in minutes). 18 23 20 15 24 22 25 17 17 26 11 19 25 23 21 22 Click here for the Excel Data File ped Find a 90 percent confidence interval for µ, assuming that the sample is from a normal population. (Round your standard deviation answer to 4 decimal places and t-value to 3 decimal places. Round your answers to 3 decimal places.) ook The 90% confidence interval to sk int rences ( Prev 7 of 10 Next >Out of the attacks that took place in 2018, was the mean number of fatalities greater in bombing/explosion attack types than in all other attack types? i need to come up with a correct statistical test to test this research based on the data that i gathered i have this. i gathered a sample of 80 ATTACKS. 33 of the attacks were sucessful attacks using BOMBINGS/EXPLOSIONS 35 of them were sucessful attackd by all other types of attacks need a way to use a statistical research method
- Can you answer all questionsAn investigator analyzed the leading digits from 794 checks issued by seven suspect companies. The frequencies were found to be 218, 130, 106, 83, 65, 48, 48, 37, and 59, and those digits correspond to the leading digits of 1, 2, 3, 4, 5, 6, 7, 8, and 9, respectively. If the observed frequencies are substantially different from the frequencies expected with Benford's law shown below, the check amounts appear to result from fraud. Use a 0.025 significance level to test for goodness-of-fit with Benford's law. Does it appear that the checks are the result of fraud? Leading_Digit Actual_Frequency Benford's_Law:1) 218 30.10%2 )130 17.60%3) 106 12.50%4) 83 9.70%5) 65 7.90%6) 48 6.70%7) 48 5.80%8) 37 5.10%9) 59 4.60% Calculate the test statistic, χ2 =? (Round to three decimal places as needed.) Calculate the P-value=? (Round to four decimal places as needed.)c) A manufacturer collected a sample of 500 light bulbs to conduct a study on the lifespan of that particular type of light bulb. The table summarizes the frequency distribution for the lifespan. 1 Number of Bulbs Lifetime of Bulbs _(hours) 300-399 4 400-499 28 500-599 97 600-699 242 700-799 96 800-899 27 900-999 6. Total 500 Required: i) By calculating the Mean, Median, Mode, Standard Deviation, the First Pearsonian Moment Coefficient of Skewness and the Second Pearsonian Moment Coefficient of Skewness comment on the Skewness of the distribution. ii) Assuming the distribution approximates a Normal Distribution what is the probability that a bulb selected at random would have a lifespan: 1. Between 500 and 750 hours. 2. Less than 450 hours. 3. Greater than 820 hours.
- 12.2.85 Question Help A survey of 1049 adults in a country, asking "As you may know, as part of its effort to investigate terrorism, a federal government agency obtained records from larger telephone and Internet companies in order to compile telephone call logs and Internet communications. Based on what you have heard or read about the program, would you say that you approve or disapprove of this government program?" Of those surveyed, 566 said they disapprove. a. Determine and interpret the sample proportion. b. At the 10% significance level, do the data provide sufficient evidence to conclude that a majority (more than 50%) of adults in the country disapprove of this government surveillance program? Click here to view page 1 of the table of areas under the standard normal curve. Click here to view page 2 of the table of areas under the standard normal curve. a. The sample proportion is (Round to two decimal places as needed.)Since the chi-square does not indicate the strength of the association, a researcher must then conduct a separate test for the measure of association. True Falseconstruct 5 examples with solution using measures of central tendency ungrouped and grouped data