The investors think that the Crypto market is showing Weak form of market efficiency. To validate the information, you run an Auto correlation test on the data you collected in last 20 days from the Crypto market. The last 20 days closing price are as follows: Days Closing price Days Closing price 1 $10,831.00 11 $10,860.00 2 $10,158.00 12 $10,401.00 3 $10,447.00 13 $10,958.00 4 $10,558.00 14 $10,496.00 5 $10,321.00 15 $10,462.00 6 $10,363.00 16 $10,552.00 7 $10,462.00 17 $10,221.00 8 $10,200.00 18 $10,733.00 9 $10,157.00 19 $10,436.00 10 $10,198.00 20 $10,100.00

Based on the test with 10days time lag is market efficient ( strong or weak ) or inefficient?