Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. A machine produces metal rods used in an automobile suspension system. A random sample of 15 rods is selected and the diameter is measured. The resulting data (in millimeters) are as follows: 1 2 3 4 No. 5 7 8 9. 10 11 12 13 14 15 Dia. 8.28 8.19 8.23 8.25 8.26 8.23 8.20 8.26 8.19 8.23 8.20 8.28 8.24 8.25 8.24 Use the data above to calculate a 95% two-sided confidence interval on the mean rod diameter. Assume the data are normally distributed. (a) Calculate the sample mean and standard deviation. Round the sample mean and the sample standard deviation to 2 and 3 decimal places respectively (e.g. 98.76 and 98.765). i i (b) Calculate the 95% two-sided confidence interval on the true mean rod diameter. Round your answers to 3 decimal places (e.g. 98.765). i

Tornadoes The following data represent the width (inyards) and length (in miles) of tornadoes.Width (yards), w Length (miles), L200 2.5350 4.8180 2.0300 2.5500 5.8400 4.5500 8.0800 8.0100 3.450 0.5700 9.0600 5.7Source: NOAA(a) Draw a scatter diagram of the data, treating width as theindependent variable.(b) What type of relation appears to exist between the widthand the length of tornadoes?(c) Select two points and find a linear model that containsthe points.(d) Graph the line on the scatter diagram drawn in part (b).(e) Use the linear model to predict the length of a tornadothat has a width of 450 yards.(f) Interpret the slope of the line found in part (c).

Determine Px and ox from the given parameters of the population and sample size. μ = 62, o = 24, n = 35 = ...

Draw the normal curve using the data given b. x = 83. s = 6 a.x = 30. s = 8 %3D

Consider the population of all laptop computers owned by students at your university. You want to know the weight of the laptop. (a) Specify the population unit. (b) Specify the variable of interest. (c) Specify the statistical population.

See picture of table attached to answer, thank you Garrison Bay is a small bay in Washington state. A popular recreational activity in the bay is clam  digging. For several years, this harvest has been monitored  and the size distribution  of clams recorded. Data  for lengths and widths of littleneck clams (Protothaca staminea) were recorded by a method of systematic sampling in a study done  by S. Scherba and  V. F. Gallucci"The Application of Systematic Sampling to a Study of lnfaunal Variation in a Soft Substrate  Intertidal  Environment,"  Fishery Bulletin, Vol. 74, pp. 937-948). The data in Tables 8-4 and 8-5 give lengths and widths for 35 littleneck clams. (a)   Use a calculator  to compute the sample mean and sample standard deviation for the lengths and widths. Compute the coefficient of vari­ation for each. (b)   Compute a 95% confidence interval for the population mean length of all Garrison Bay littleneck clams. (c)   How many more littleneck clams would be needed in a…