Finding midpoint for class with greatest frequency

Assignment Help Basic Statistics
Reference no: EM1322864

Q1) In random sample of 46 bolts, mean length was 1.28 inches and standard deviation was 0.07 inch. Use normal distribution or a t- distribution to create a 99% confidence interval for the mean.

Which distribution must be used to create the 99% confidence interval ?

a) Use normal distribution as the lengths are normally distributed and σ is known.

b) Use t-distribution because n≥ 30.

c) Use t- distribution as lengths are normally distributed and σ is known

d) Use normal distribution because n≥ 30.

e) 99% confidence interval is?

Q2) Using given data table, determine class interval for the wage table?

 Hourly Wages # Employees \$4 to \$8 20 \$8 to \$12 40 \$12 to \$16 15 \$16 to \$20 5

a) \$4

b) \$10

c) \$14

d) \$20

Q3) Using  given data table, find out midpoint for class with greatest frequency?

 Hourly Wages # Employees \$4 to \$8 20 \$8 to \$12 40 \$12 to \$16 15 \$16 to \$20 5

a) \$4

b) \$10

c) \$14

d) \$20

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