Answer:
Step-by-step explanation:
Data given and notation
represent the sample mean given
represent the population standard deviation
sample size
represent the value that we want to test
t would represent the statistic (variable of interest)
State the null and alternative hypotheses.
We need to conduct a hypothesis in order to check if the true mean for the gasoline prices is lower than 1.25, the system of hypothesis would be:
Null hypothesis:
Alternative hypothesis:
If we analyze the size for the sample is > 30 but we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:
(1)
Calculate the statistic
We can replace in formula (1) the info given like this:
Answer:
i think i used it before
Step-by-step explanation:
The ration is 10/7
Divide 55 and 35 by 5 to reduce the fraction of 55/35 and you get 10/7
The unit price per kg is $5, to find this divide the 9 kilograms into the price $45 the answer is what each kilogram is worth