Abattery manufacturer was considering changing suppliers for a particular part. the purchasing manager required that the average cost of the part be less than or equal to $32 in order to stay within budget. a sample of the 32 initial deliveries had a mean of the new product upgrade price of $28 with an estimated standard deviation of $3. based on the data provided, the z value for the data assuming a normal distribution is?
a) 0.67
b) 1.33
c) 2.67
d) 4.33

1.33

Step-by-step explanation:

Given that a battery manufacturer was considering changing suppliers for a particular part. The purchasing manager required that the average cost of the part be less than or equal to $32 in order to stay within budget.

Sample size n =32

Mean of sample = 28

Std deviation of sample s= 3

Std error of the mean =

Mean difference = 28-32 = -4

Test statistic Z = mean difference/std deviation

=

i think this could be a possible answer (1 / 84) -1

good luck! : d