Seatbelts is a built-in R time-series, giving the monthly totals of car drivers in Great Britain killed or seriously injured Jan 1969 to Dec 1984. We are interested in some descriptive statistics related to the rear column of the Seatbelts time series. We can access the data directly by using the assignment x<-Seatbelts[4]. (In R use ?Seat info on this time series.) Remember: x <- Seatbelts[4] a.Calculate the sample mean of x. b. Using the R quantile function, find the .70 (70th) percentile of x. 2 c. Calculate the interquartile range of x using R. [3] Calculate Selsylate the sample median of x.

The table gives some information about the delays (in minutes) of 80 flights. Delay (n minutes) Frequency Cumulative frequency 10 - 19 16 16 20 - 29 26 42 30 - 39 23 40 - 49 10 75 50 - 59 5 80 The number of flights which delayed 39 minutes or less than 39 minutes is:65 flights. true false

How to construct the Cumulative Frequency Distributions? Explain with the example.

how can i tell is a frequency table is skewed

Q1/The following table represents the number of lectures on engineering statistics for the second stage, the Department of Electrical Engineering, distributed throughout the week. Required: Find the weighted arithmetic mean and squared mean and indicate the days of the lecture? number of lectures 4 30-40 40-50 50-60 60-70 70-80 80-90 90-100 6 8 4 6 4 8

For the residents in 2014, use R to calculate the interval with 99% certainty that the interval contains the actual population mean of the residents by census tracts. Type in the interval with keyboard. We also know that in each year, the number of residents by census tract in the State of Maryland follows a normal distribution, and the variance in the number of residents within the State of Maryland is the same for different years.  POP2014: 3072, 1989, 3794, 2689, 3211, 3722, 4385, 4009, 7598, 3862, 3097, 2726, 4881, 4157, 2570, 2512, 2518, 4863, 4147, 7139, 6067, 6819, 3705, 3239, 3824, 4977, 2576, 2940, 9791, 5231, 5634, 5337, 4205, 3888, 5562, 3335, 3770, 1808, 2045, 1532, 5420, 4993, 6109, 4377, 5424, 4976, 4507, 3738, 2827, 3485, 1559, 5199, 4702, 3971, 3803, 3356, 4670, 3816, 5477, 4760, 3126, 3630, 3755, 3795, 2578, 3382, 4005, 2442, 6096, 3799, 3843, 3836, 6046, 6431, 3561, 3142, 4829, 5058, 2471, 6119, 3523, 3094, 3146, 3356, 2618, 2366, 4266, 4016, 6080, 1554, 6878, 3645,…

Question 6 The set of scores on a mathematics test is 72, 80, 80, 82, 87, 89, and 91. The mean score is 0 84 0 83 0 82 0 80 « Previous N 69

Suppose that we doubled everyone's original salary what will happen to the mean and sd