hello i need help with these statistic questions thank you

question 1

Agrocerg'.r store claims that customers spend an average of 4 minutes waiting for service at the store's deli counter. A random sample of 60 customers was timed at the deli counter. and the average service time was found to be 4.5 minutes. Assume the standard deviation is 1.9 minutes per customer. Using or =0.05, complete parts a and b below. a. Does this sample provide enough evidence to counter the claim made by the store's management? Determine the null and alternative hypotheses. H0:p V H1:p V The ztest sta istic is . (Round to wo decimal places as needed.) The critica zscore(s) is(are) . (Round to wo decimal places as needed. Use a comma to separate answers as needed.) Because the test statistic Y Y the null hypothesis. b. Determine the pvalue or this test. The p-value is . (Round to three decimal places as needed.) The recommended dietary allowance (RDA) of iron for adult females is '18 milligrams (mg) per day. The given iron intakes (mg) were obtained for 45 random adult females. At the 5% significance levelI do the data suggest that adult females areI on average, getting less than the RDA of 18 mg of iron? Assume that the population standard deviation is 4.9 mg. Preliminary data analyses indicate.I that applying the ztest is reasonable. (Note: )_ 0.56 O D. Ho: p 2 0.56; HA: P