In developing an interval estimate, if the population standard ...

[tichca]

In developing an interval estimate, if the population standard deviation is unknown
 a. it is impossible to develop the interval estimate.
   b. the standard deviation is arrived at using the range.
   c. the sample standard deviation must be used.
   d. it is assumed that the population standard deviation is 1.

Question 2

Gradual shifting or movement of a time series to relatively higher or lower values over a longer period of time is called
 a. seasonality.
  b. a cycle.
 c. indexing.
 d. trend.

[bpool94]

Answer to Question 1

c

Answer to Question 2

d

[tichca]

Thanks for the timely response, appreciate it

[isabelt_18]

Wow, this really help